The document discusses the need for and development of dedicated freight corridors in India to handle the growing volume of freight. It notes that freight traffic has been growing at 15-18% annually, leading Indian Railways to plan a 10,000 km network of dedicated freight lines with 25-tonne capacity. The corridors will run parallel to major routes and segregate freight and passenger traffic, allowing heavier trains. High rise overhead electrification is also being implemented on sections to enable double-stack container transport. Challenges of maintaining the higher overhead equipment are also reviewed.

2. Need for Dedicated Freight Corridor
 The increase in transport volume of domestic
freight shows a growth rate of 15 to 18% per annum.
As a part of this strategy, Indian Railways have
planned to build a 10,000 Kms. Network of
dedicated heavy - haul freight Corridor for 25
tonne axle load (or possibly more) movement
called Dedicated Freight Corridor (DFC).
 All this has led to the concept of the Dedicated
Freight Corridors along the Eastern and Western
Routes.

3. Need for Dedicated Freight Corridor
 The idea is to segregate Passenger and Freight
traffic, and thereby maximising the line capacities.
The new lines would allow movement of heavier
trains as compared to present freight trains.
 The new lines would run parallel to the so-called
Golden Quadrilateral linking Kolkata, Delhi,
Mumbai and Chennai as well as other high-density
corridors. The first two lines will be designated as
the Eastern Corridor and Western corridor.

4. High Rise OHE
High rise OHE commissioned first time in IR in RE-
RGS-FL section of Jaipur Division (213 RKM/264 TKM)

5. Design of High Rise OHE
 Development of high rise OHE have the following
salient challenges:
• Design of Foundation
• Design of Portals/Masts
• Design of ATD
• Ensuring adequate Stagger & Span for OHE
 Ensuring proper gradient of transition phase OHE,
so that Pantograph may negotiate it smoothly in
both directions.
 Modification of Tower wagon to make it suitable
for running on high rise OHE lines.

6. High Rise OHE
Movement of double stack container with maximum
height 6809 mm on electric traction
Single stack container Double stack container
7.100 m

7. Advantage of Double Stack
Container
 The major advantages of Double Stack
Container operation are:
 Increase in transport volume
 Increased throughput
 Reduction in unit cost.

8. Parameters High Rise OHE
Description Conventional
OHE
High Rise OHE
Height of contact
wire at support
5.80 m 7.57 m
Height of contact
wire at mid span
5.70
(Pre sag 100mm)
7.52 m
(Pre sag 50mm)
Height of catenary
wire
7.20 m 8.97 m
Maximum OHE
span
72.00 m 54.00 m
Maximum speed 160 kmph 140 kmph

9. Parameters High Rise OHE
Description Conventional OHE High Rise OHE
SS wire rope of ATD 08.00 m 10.00 m
Guy rod length 09.00 m 12.30 m
Length of OHE mast 9.50 m 11.40 m
Maximum stagger on
tangent track
200 mm +_ 150 mm
Maximum stagger on
curve
300 mm +_ 250 mm

10. Clearances under over line structure
(High rise OHE)
SN Type of over line structure Minimum
headroom
clearance
1 Light overhead structure, such as
FOB
8.43 m
2 Heavy overhead structure such as
ROB, Flyovers
8.05 m
3 Heavy overhead structure such as
ROB, Flyovers, if any turnout or
crossover is located underside or
nearby 40 m
8.43 m

11. Clearances under over line structure
(Under restriction)
For these minimum restricted heights, catenary wire shall be
terminated outside overhead structure.
SN Type of over line structure Minimum
restricted
heights
1 Light overhead structure, such as FOB 7.568 m
2 Heavy overhead structure such as ROB,
Flyovers
7.468 m
3 Heavy overhead structure such as ROB,
Flyovers, if any turnout or crossover is
located underside or nearby 40 m
7.568 m

12. Clearances for Power Line Track
Crossing
SN voltage Minimum clearance
from Rail level (New
crossing or planned for
alteration)
Minimum
clearance b/w
highest
conductor and
lowest
transmission
line crossing
conductor
For
conventional
OHE
For high
rise OHE
1 Above 11 upto 33 kV 14.66 m 16.66 m 2.44 m
2 Above 33 upto 66 kV 14.96 m 16.96 m 2.44 m
3 Above 66 upto 132 kV 15.56 m 17.56 m 3.05 m
4 Above 132 upto 220 kV 16.46 m 18.46 m 4.58 m
5 Above 220 upto 400 kV 18.26 m 20.26 m 5.49 m
6 Above 400 upto 500 kV 19.16 m 21.16 m 7.94 m
7 Above 500 upto 800 kV 21.86 m 23.86 m 7.94 m

13. Maintenance of High rise OHE
Schedules of maintenance are as under:-
 Foot Patrolling
 Trolley Inspection / Foot Plate
 Current Collection Tests
 Annual Maintenance & TOWER WAGON Checking
 Periodical Overhauling (POH)
 Live line checking / HOT Line Checking
 Special Checks

14. Foot patrolling
Due to more height of
OHE visibility during
foot patrolling is
difficult
Constraints in Maintenance in High
Rise OHE

15. Tower Wagon Design
 Due to almost 2mtr
higher height of OHE
during live line checking
visibility is not proper.
 Pantograph needs
modification with high
reach OHE.
 Deck needs modification
for working on high rise
OHE
Constraints in Maintenance in High
Rise OHE

16. As height of OHE is
7.57 m (Contact) and
8.97 m (Catenary),
working of staff at this
height is difficult.
Constraints in Maintenance in High
Rise OHE

17. Emergency Mast
Height of Emergency
mast in conventional OHE
is 8.90 m
(as per RDSO spec. ETI/C/0072)
For High rise OHE no
drawing of emergency
mast has been provided
by RDSO the matter was
discussed in 30th MSG
and matter is under
consideration of RDSO
Constraints in Maintenance in High
Rise OHE

18. Tools & Plants for High Rise
OHE
Discharge rod
Length of cable is 10.50
m + 2.50 mtr in compare
to conventional discharge
rod of length 7.50 m +
1.50 mtr cable
Folding fibre sticks
(1.66m each) for holding
cable – 04 nos.
 Erection of discharge
rod demands extra
manpower.

19. Tools & plants for High Rise OHE
Discharge Rod
 It needs to be bound at
bottom fitting instead of
number plate as in
conventional hence unsafe.
 Due to too much length of
discharge rod while erecting
it in mid lines of yard it
enters in to another
elementary sections.
 It is very difficult to handle
when lifting it for erection.

20. Tools & Plants for High Rise OHE
Extensible ladder
 Length of extensible
straight ladder has been
proposed as 13.00 m
compared to conventional
ladder of 11.00 m

21. Tools & plants for High Rise
OHE
 Extensible ladder
• More manpower needs to be
employed for working on it.
• It swings due to increased
length but no modification in
thickness.

22. Merging with Conventional OHE with
High Rise OHE
Height of Conventional Contact wire = 5.80 m
Height of High Rise Contact wire = 7.57 m
Difference between contact wire = 1.77m
Gradient @ 10 mm/m

23. PANTOGRAPH SELECTION