Summer Internship Report

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SUMMER INTERNSHIP REPORT
NOIDA METRO RAIL CORPORATION LTD.
……………………………………………………………………………………
Department of Electrical Engineering
School of Engineering
Gautam Buddha University
Gautam Budh Nagar (U.P.), India
Submitted By:-
Ankit Kumar Chaudhary
Roll No.:-15/IEE/055
Electrical Engineering,9th
sem

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Preface
This report documents the work done during the summer training at Training
Institute, Noida Metro Rail Corporation Limited, Noida under the guidance of
Mr. Bhupendra Kumar. The report first shall give the overview of tasks
performed during the period of training.
Report shall also elaborate about the working of NMRC.
I have tried my best to keep the report simple yet technically
correct. I hope I succeed in my attempt.
Ankit Kumar Chaudhary

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ACKNOWLEDGEMENT
It is a great pleasure to present this report of Summer Training about Noida
Metro Rail Corporation Ltd. in partial fulfilment of B. Tech. Program under
Gautam Buddha University, Greater Noida (U.P.) India.
At the Outset, I would like to express my immense gratitude to my training guide,
Mr. Bhupendra Kumar, for providing me with the opportunities of studying,
learning and gaining practical experience in various fields during the period of
training. Her invaluable suggestions not only helped me to reach the successful
completion of the tasks assigned, but also made me learn a lot. I am falling short
of words for expressing my feelings of gratitude towards her for extending her
valuable guidance, through critical reviews of project and the report and above
all the moral support she had provided me with all stages of this training.
Ankit Kumar Chaudhary
Roll No.:- 15/IEE/055
Electrical Engineering,9th
SEM
Gautam Buddha University

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CONTENTS
Topics Page
1)Abstract……………………………………………………………………….5
2)Introduction of NMRC ……………………………………………………...6-8
3)Introduction of Electrical Department in NMRC………………………….8-19
A). Rolling Stock Department
B). Power System (Traction)
4)Configuration of workshop power supply………………………………...19-23
5)Component of OHE………………………………………………………23-30
6)Overview of Train Configuration………………………………………...30-35
7)HVAC Control…………………………………………………………...35-39
8)Photos……………………………………………………………..40
9)Conclusion…………………………………………………………………...41
10)Reference…………………………………………………………………...42

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Abstract
The Noida Metro Rail Corporation Ltd. is a metro system serving Noida & Greater Noida.
NMRC is a very vast and huge industry and it has a large number of EE opportunities. Some of
them are Metro train HT system, Propulsion system, Auxiliary Power system, Train HVAC, Door
System, PA/PIS System, Depot M&P, Fire Protection Arrangement, Lift & Escalators, Depot
Traction Layout, Power Supply Arrangement etc.
Signalling is used to control the traffic on the railway tracks, to control the movement and speed of
the metro trains on various lines. There are many types of signals used in NMRC which convey
their own different message. The signalling system is controlled and managed by the Operation
Control Canter (OCC) which are situated at Block-3, Ganga Shopping Complex, Sector-29, Noida.
After that comes the telecommunication. It is the backbone of NMRC. If somehow the
communication system fails all the operations and movement of trains will be stopped immediately.
Telecommunication means the exchange of information and data between two or more points.

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Introduction of NMRC
The Noida Metro is a rapid transit system connecting the twin cities of Noida & Greater Noida in
Gautam Buddh Nagar, Uttar Pradesh, India. The Phase-1(21 stations) has been successfully
completed at a cost of Rs. 5,503 crore, while Phase-2(9 station) is planned.
The metro network consists of one line with a total length of 29.7 km. The trains are composed of
four cars to be extended up to six in the future. Noida metro becomes 11th
metro system in India to
be operational. It is the 5th
longest operational metro network in India after the Delhi metro
Hyderabad metro, Chennai metro and Namma metro.
Overview :-
Owner Noida metro rail corporation
Area served Noida & Greater Noida
Locale Noida & Greater Noida, (Gautam Buddh
Nagar, Uttar Pradesh, India)
Transit Type Rapid Transit
Number of lines 1(Operational)
1(Planned)
Number of Stations 21
Headquarters Block-3, Ganga Shopping Complex, Sector-
29, Noida
Chief executive K Sanjay Murthy (Chairman)
Alok Tandon (Managing Director)
Website www.nmrcnoida.com

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Operation:-
Began operation 25 January 2019
Operator(s) DMRC & NMRC
Character Elevated
Train Length 4 coaches
Headway 10-15 minutes
Technical:-
System Length 29.7 km
Track Gauge 1,435 mm
Electrification 25 KV AC
Top Speed 80 km/h
The line connects to Delhi Metro at Noida Sector 51 Station. Foundation for the NMRC project
was laid down in October 2014, with the construction being commenced by the end of December
2014 by then chief minister of Uttar Pradesh Akhilesh Yadav. Trial runs started in August 2018
and the metro was inaugurated on 25 January 2019 by chief Minister of Uttar Pradesh, Yogi
Adityanath.

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Fig 1: Metro Route
Cab Equipment
drive desk
The driver desk is set in the left of the Cab. The material of the shell of drive desk
is FRP. FRP is easy to form in irregular shape.
Fig 2: Drive Desk

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Panel 1 is used for indicate information such as status mileage voltage air
pressure.
Fig 3: Panel 1
No. abbreviation Function
1 ABAI All Service Brake Apply Indicator
2 ABRI All Service Brake Release Indicator
3 CBTCI CBTC Mode Indicator
4 SCSI Safety Cut-out Switch Indicator
5 NSLI Neutral Section Led Indicator
Panel 2 is used for indicate and train control operate.
Fig 4: Panel 2

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Panel 2 is used for indicate and train control or operate.
No. abbreviation Function
1 STPB Start Push Button
2 ROSPB ROS Mode Push Button
3 ATBPB Automatic Turn Back Push Button
4 DCPB1 L Doors Close Push Button Number 1
side Left
5 DOPB1 L Doors Open Push Button Number 1
side Left
6 DOPB1 R Doors Open Push Button Number 1
side Right
7 REBPB Reset Emergency Brake Latch Push-
Button
8 EMPB Emergency Brake Push-button
9 PBAPB Emergency Brake Apply Push-Button
10 PBRPB Parking Brake Release Push-Button
11 VCBCPB VCB Close Push-Button
12 VCBOPB VCB Open Push-Button
13 TAS Train Active Switch
14 EWS Electric control whistle switch
15 WCCS1 Windshield Cleaning Control Switch 1
16 HLCS Head Light Control Switch
17 COLS Call On Light Switch
18 PLCS Passenger Light Control Switch
19 DCPB1 R Doors Close Push Button Number 1
side Right
2 DOPB1 R Doors Open Push Button Number 1
side Right
20 CVS Cab Ventilation Switch
21 DCAPB Door Close Announcement Pushbutton
22 EBRI Emergency Brake Apply Indicator

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A storage box is set in the right side of Cab .
This box is made of aluminum alloy.
Some button and switches are set on it.
Fig 5: Panel 3
No. abbreviation Function
1 PCS Pantograph Control Switch
2 UNPB Uncouple Push Button
3 EMPB Emergency Brake Push-button
4 CLS Cab Light Switch
5 WCCS2 Windshield Cleaning Control Switch 2
Fig 6: Panel 4

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No. abbreviation Function
1 DCPB2 L Doors Close Push button Number 2 side Left
2 DOPB2 L1 Doors Open Push Button Number 2 side Left 1
3 DOPB2 L2 Doors Open Push Button Number 2 side Left 2
No abbreviation Function
1 DCPB2 R Doors Close Push Button Number 2 side Right
2 DOPB2 R1 Doors Open Push Button Number 2 side Right 1
3 DOPB2 R2 Doors Open Push Button Number 2 side Right 2
Fig 7: Inner Door
RCA
FDUTDU
RCA
RADIO

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Fig 8: CAB Side
Fig 9: Cab System Layout
Emergency Evacuation System
Fig 10: Emergency Evacuation System
Interfaces
reserved for
CCAM
CLS

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vertical passage dimension (height) ≥1900mm
Vertical passage dimension (width) ≥1000mm
INTRODUCTION OF ELECTRICAL DEPARTMENT IN NMRC
A). ROLLING STOCK DEPARTMENT
The metro uses lightweight rakes made of stainless steel and aluminum, manufactured by
China's CRRC Corporation. Each train has a seating capacity of 186 and a standing capacity of 848,
with total capacity of 1,034 passengers. Nineteen rakes with four coaches each, a total of 76 coaches,
will operate of the Aqua Line. The cost of each coach is ₹4 crore (US$580,000). Trains are equipped
with a passenger information system, a public address system and an emergency announcement system
from the operation control center.
Rolling stock department is backbone of any urban transport system.
In this department major function-
 First line inspection (Inspection of Trains)
 Second line inspection (Overhauling sections)
 Maintenance of trains
The term rolling stock in rail transport and metro industry refers to any vehicles that move on
a railway. It usually includes both powered and unpowered vehicles, for
example locomotives, railroad cars, coaches, and wagons. In the US, the definition has been
expanded to include the wheeled vehicles used by businesses on roadways.
To promote comfortable and accurately operating railway transportation, Toshiba has worked
to develop the various systems and devices installed in railway rolling stock from the
propulsion system to the Train Safety System. Recently, we are not only meeting the need for
performance and function in things such as speed and reliability, also work to reduce
environmental impact when we develop rolling stock systems. We offer diverse products that
aim to advance environmental performance in Japan and overseas.

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B).POWER SYSTEM (TRACTION)
The primary function of the auxiliary power system is to transform the AC373V power from main
transformer to AC415V 50Hz, AC230V 50Hz and DC110V. The converted power is used to supply
air-conditioner, air compressor, oil pump of main transformer, lighting system, TCMS, signal system
and control circuit.
Power supply network of auxiliary system includes:
1.Auxiliary converter outputs alternating current of 3-phrase 415V single-phrase 230V, 50HZ
2.Battery charger outputs 110VDC
3.Medium voltage bus (3-phrase 415V, AC, 50Hz)
4.Bus line isolation contactor- It will be opened when there is short circuit in medium voltage bus
5. Battery，260Ah, Ni-cd battery
6.Workshop Power Supply
7. Low voltage bus(110V DC);
8.Low voltage box.
 AC power network
Fig 11: AC Power Network

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The two auxiliary inverters (SIV) on the whole train can provide the power (AC415V, AC230V) with
parallel power supply applied between unit trains and each SIV has two ways of output – the three-
phase AC415V, 50Hz AC power through the whole train and the single-phase AC230V, 50Hz AC
power through the half train.
DC Power Network
Fig 12: DC Power Network
Battery chargers (BCG) on the whole train will provide the power (DC110V) with parallel power
supply applied between unit trains and there are three bus lines (permanent bus, prepared bus and
negative bus).
The permanent bus is supplied by :
 Battery , when the vehicle is sleep or awake with pantograph at standby position;
 BCG, when the vehicle is awake with pantograph at working position.The prepared bus is
supplied by:
 Battery , when the vehicle is awake with pantograph at standby position;
 BCG, when the vehicle is awake with pantograph at working position.The negative bus is used
for DC system to reflow.

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 Battery configuration
There is one group of battery on each M car. Every group of battery has 90 cells combined with
80 real cells and 10 false cells (only cell box，upside down installation, not connected to
battery circuit and water filling system). Arrangement of half group of battery as follows:
Fig 13: Battery Configuration

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 Battery box structure
The battery box consists of battery box (Main part) and battery control box.
Fig 14: Battery Box Structure

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 Battery control box
Battery fuses and BIS (battery isolation switch) is fitted in the battery control box.
Fig 15: Battery Control Box And Fuses
 Configuration of workshop power supply
Workshop power supply includes: AC415V power supply socket and AC230V on board outlet socket.
In the case of vehicle maintenance, if there is no AC25KV high voltage power supply, it can still
maintain the vehicle.

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Item DT M M
DT
AC 415V Workshop power
supply socket 2 0 0
2
AC 230V outlet socket 4 3 3
4
USB 3 2 2
3
When the AC25KV high voltage is not available, the maintenance personnel can provide the power to
the auxiliary electrical equipment in a unit (DT*M) by the AC415V power supply socket.
When the high voltage is not available, but AC415V is available, the maintenance staff can provide
power for single phase load by the AC230V socket, single phase load mainly including cleaning
equipment, mobile phones, and laptops. When the train has AC25KV high voltage, the AC230V socket
can also be used. USB is also provided to meet the needs of passengers to charge the phone.
a).FLEXIBLE OHE SYSTEM AT NMRC
Three phase Power supply is received from discoms at 220/132/110/66 kV .Stepped town to 25 kV
single phase at Receiving substations. Fed to Feeding Posts located at viaducts through cables.
Feeding posts generally spaced at 10-15 kms . Feed from adjacent RSS is isolated with neutral
section at Sectioning Posts for phase separation.

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Fig 16: Traction Return Scheme
I. GENERAL CONCEPT OF 25KV OHE SYSTEM
 Sectioning:
• The overhead equipment is divided electrically into sections using neutral sections,
insulated overlaps and section insulators .
• Under normal working conditions, electrical continuity is maintained by bridging the
insulated overlaps by means of interrupters or isolators.
• Isolation of small sections of OHE for maintenance and repairs is possible.
• Overlaps: overlapping portion between two tension lengths
a. Insulated overlaps
b. Un-insulated overlap

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Fig 17: Sectioning
 Switching Stations (SP):
 At the Neutral section, a Sectioning and Paralleling post (SP) is created.
 Under any emergency requirement, the power supply of the adjacent substation
may have to be drawn to the other (substation) section. This is done through Bridging.
 Bridge Interrupters normally has to be OPEN .
 Sectioning & Paralleling Interrupters are normally kept close.
 Depending on the distance between an FP and SP (Feeding post to a Neutral section) 2
or 3 Sub sectioning and Paralleling posts are created.
 Paralleling interrupters are provided at SSP and SP to parallel the Up & Down
track OHE, in order to reduce the voltage drop and to facilitate movement of traffic in
case one subsector or one or more elementary section is faulty or taken up for
maintenance.

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 Neutral Section:
To segregate the power supply of feed from two different Substations having phase and
voltage difference, neutral sections are provided in OHE in between two substations.
Fig 18: Neutral Section
COMPONENT OF OHE
 Mast/Structure
 Cantilever Assembly
 Wires
 Section Insulators
 Automatic Tensioning Devices (ATDs)

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 Normal Mast
Fig 19: Normal Mast
Tubular poles
Fig 20: Tubular Poles

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Two Track Cantilever Mast
Fig 21: Two Track Cantilever Mast
3 TRACK PORTAL ARRANGEMENT
Fig 22: 3 Track Portal Arrangement

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Cantilever Assembly
Fig 23: Cantilever Assembly

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The contact and messenger wires are run on support of Cantilever assemblies. These cantilevers are
properly insulated for the Steel mast by means of Insulators.
The cantilever assembly mainly consists of -
1. Stay Tube
2. Bracket Tube
3. Register tube
4. Steady Arm
 Contact wire
Fig 24: Contact wire
● It is a solid, hard drawn, grooved copper wire supported at regular intervals by means of
droppers.
● DMRC uses contact wire of 150sqmm cross section. In some lines 107sqmm is also used (line-
4,5,6).
● The tension in contact wire is 1200kgf for 150sqmm contact wire and 1000 kgf for 107sqmm
contact wire.

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Messenger wire
● Stranded alloyed copper wire having a cross section of 65 sq.mm.
● 19 strands each of dia 2.10mm with an overall dia of 10.50mm from which the contact wire is
supported.
● Messenger wire is used to support contact wire mechanically.
● Copper alloyed with 0.7-1.0% cadmium for mechanical strength.
● In DMRC phase-III (Line 7), Copper alloyed with 0.5% Magnesium has been used due to their
better characteristics and environmental friendliness.
 Insulators
 Polymer composite type Insulators are used in place of ceramic insulators.
 Typically Composed of centre rod made of fibre reinforced plastic and an outer shed
made from silicon rubber.
 Less costly, lighter in weight, better hydrophobic capability.
 Delhi being in most polluted zones, the creepage distance of insulators has been
increased from 1050 mm to 1600 mm.

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Fig 25: Insulators
Automatic Tensioning Device
Fig 26: Automatic Tensioning Device

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These are provided to keep the tension in OHE conductors constant irrespective of
expansion/contraction with temperatures. Installed at termination of OHE conductors for each tension
length.
In DMRC Following types of ATDs are used:-
i. BWA type
ii. Gas Type
iii. Spring Type
● Helical Spring Type
● Spiral Spring Type
OVERVIEW OF TRAIN CONFIGURATION
Equipment Location
Quantity
DT M M DT
Pantograph
(PAN)
Roof 1 / / 1
Lightning
arrester (LA)
Roof 2 / / 2 2
Potential
transformer
(PT)
Roof 1 / / 1
Vacuum
circuit breaker
(VCB)
Roof 1 / / 1
Earthing
Switch (EGS)
Roof 1 / / 1
Current
transformer
(CT)
Underframe 1 / / 1

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i. Pantograph
Fig 27: Pantograph
The pantograph system includes a mechanical structure，
 Frame
 Hinged system (Lower arm, Upper arm, Lower rod, Adjusting rod)
 Balancing system
 Collector head
 Pneumatic control unit.

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Fig 28: pantograph system includes a mechanical structure
i. Lightening Arrester
Fig 29: Lightening Arrester

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 A lightning arrester (alternative spelling lightning arrestor) (also called lightning
diverter) is a device used on electric power systems and telecommunication systems to
protect the insulation and conductors of the system from the damaging effects
of lightning.
 The typical lightning arrester has a high-voltage terminal and a ground terminal. When
a lightning surge (or switching surge, which is very similar) travels along the power
line to the arrester, the current from the surge is diverted through the arrester, in most
cases to earth.
ii. Potential Transformer
Fig 30: Potential Transformer
Potential transformer is a voltage step-down transformer which reduces the voltage of a high voltage
circuit to a lower level for the purpose of measurement. These are connected across or parallel to the
line which is to be monitored.

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iii. Vacuum Circuit Breaker
Fig 31: Vacuum Circuit Breaker
A vacuum circuit breaker is a kind of circuit breaker where the arc quenching takes place in
vacuum medium. The operation of switching on and closing of current carrying contacts and
interrelated arc interruption takes place in a vacuum chamber in the breaker which is called
vacuum interrupter.
iv. Earthing Switch
Fig 32: Earthing Switch
Earthing switches are safety devices which are integral parts of circuit breakers. When a circuit breaker
is removed and racked out, the sections of the bus bar adjacent to the circuit breaker are automatically
earthed by means of these switches.

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v. Current Transformer
Fig 33: Current Transformer
A current transformer is an instrument transformer, used along with measuring or protective
devices, in which the secondary current is proportional to the primary current (under normal
conditions of operation) and differs from it by an angle that is approximately zero.
HVAC Control
In each car, there are two HVAC units, and each HVAC units has one separate
control system.
This system will control the temperature, fresh air damper, compressor starting,
smoke alarm, etc.

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Fig 34: HVAC Control
Temperature Control
Fig 35: Cooling Control
The right picture shows the control for cooling, heating and DEHUM.
Cooling:
Cool1 (50%) will start when the temperature is higher than the set point.
Cool2 (100%) will start when the temperature is 1℃ higher that the set point.
And when the temperature is falling, than:
When the temperature reaches SP+0.5 ℃, cool2 will turn to cool1.
When the temperature reaches SP-0.5 ℃, cool1 will turn to ventilation.

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Fig 36: Heating Control
For the Heating, it is just controlled by the temperature.
When the temperature ＜18℃(set point), heating will start.
When the temperature ＞18℃(set point), heating will stop.
When heating is working, ventilating at the same time.

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Dehumidification Control
Fig 37: Dehumidification Control
For the DEHUM, it will be started when
When the AC is in ventilation mode.
(AND) The temperature should higher than 24℃(SP-1).
(AND) RH≥60%.
When DEHUM started, heating and 50% cooling will be working.
And it will be shut down when
The temperature is lower than 24℃。
(OR) The temperature is higher than 25℃.
(OR) RH＜60%.

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Fresh air damper Control
Fresh air damper is controlled automatically. The air-conditioning control system of saloon controls the
opening position of fresh air damper according to train passenger capacity information transmitted by
the TCMS system.
The fresh air damper in the air-conditioning unit can achieve six-position adjustment, i.e. closed, 25%,
50%, 75%, 100% and fully-open.
Compressor Starting Control
Compressor start will be controlled as following figure. In order to ensure the start impact of air-
conditioning compressor does not influence the normal work of SIV, time-sharing control is adopted
for the start of air-conditioning compressors of this project. Sequence starting of air-conditioning
compressors will be executed according to their respective start permission signal.
At the same time, the start priority of air-conditioning compressors is lower than the air compressors of
braking system. Whenever air compressor needs to be started, the start of air-conditioning compressor
will be postponed..
Fig 38: Compressor Starting Control

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Photos
Fig 39: Metro Cab Fig 40: Metro Coach
Fig 41: Metro Workshop
Fig 42: Drive Desk

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CONCULUSION
Noida Metro is one of the most important means of transportation. It will save the time and energy of
the people. It also reduces traffic problems and traffic jams. Metro is most advance step taken by the
government which will give Noida a solid foot mark in this world. Because it directly cut of the timeline
from humans lifeline. It reduced the distance between health & money, reduces pollution.
We summerised about Noida Metro Rail Corporation, it has three department first one rolling stock
,signaling and power system. An eco-friendly, zero-discharge depot constructed on 25 Hectare of land
features roof-top solar panels and water recycling facilities. It offers facilities for the accommodation
and maintenance of the train sets. Two receiving substations were commissioned to support the power
requirements of the rolling stock and stations. Additionally, 21 auxiliary substations were
commissioned in all the 21 stations along the metro line. The trains will be powered by 25kV AC
overhead catenary system. Noida Metro is equipped with communications-based train control (CBTC)
signalling system supplied by Hitachi. Noida Metro will run a fleet of 19 lightweight trains provided
by CRRC Nanjing Puzhen. Each train consists of two motor train units and two trailers units and can
accommodate 1,034 passengers.

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REFERENCE
 www.nmrcnoida.com
 https://en.m.wikipedia.org/wiki/Noida_Metro