ABOUT ALL TRAIN TRACK JUNCTION

1. TRACK JUNCTIONS & SIMPLE TRACK LAYOUTS
Presenting by :
P.RAMA CHANDRA KIRAN

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Track Junction
 Track junctions are formed by the
combination of points and crossings.
 Their main objective is to transfer rail
vehicles from one track to another or to
enable them to cross from one track to
another.
 Depending upon the requirements of
traffic.
Track Junction

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Types of track junctions
 There can be several types of track junctions with simple track layouts.
 The most commonly used layouts Or Track Junction Types discussed in the
following are

4. Turnout Of Similar
Flexure
 A turnout of similar flexure
continues to run in the same
direction as the main line curve
even after branching off from it.
 The degree of the turnout curve
will be higher than that of the
main line curve.
 The degree and radius of the
turnout curve given by the
formulae
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Turnout Of Similar Flexure

5. Turnout Of Contrary
Flexure
 A turnout of contrary flexure takes
off towards the direction opposite
to that of the main line curve.
 In this case, the degree and radius
of the turnout curve given by the
following formulae.
 Dm is the degree of the rail of the
main track on which the crossing
lies, i.e., the outer rail
in Fig.
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Turnout Of Contrary Flexure

6. Symmetrical Split
 “Alien a straight track splits up in
two different directions with equal
radii, the layout known as a
symmetrical split.
 In other words, a symmetrical spat
is a contrary flexure in which the
radii of the two curves are the
same.
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Symmetrical Split

7. Three-Throw Switch
 In a three-throw arrangement, two turnouts take off
from the same point of a main line track.
 A three-throw switch has two switches and each switch
has two tongue rails placed side by side.
 There is a combined heel block for both the tongue rails
of the switch.
 Three-throw switches used in congested goods yards
and at entry points to locomotive yards, where there is
much limitation of space.
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Three-Throw Switch

8. Double Turnout
 A double turnout or tandem is an improvement over a three-throw
switch.
 In a double turnout, turnouts staggered and take off from the main
line at two different places.
 The distance between the two sets of switches should be adequate
to allow room for the usual throw of the point.
 Double turnouts mostly used in congested areas, particularly where
traffic is heavy, so as to economize on space.
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Double Turnout

9. Diamond Crossing
 A diamond crossing is provided when two tracks of
either the same gauge or of different gauges cross
each other.
 It consists of two acute crossings (A and C) and two
obtuse crossings (B and D).
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Diamond Crossing

10. Single Slip and Double Slip
 In a diamond crossing, the tracks cross each other,
but the trains from either track cannot change track.
 Slips are provided to allow vehicles to change track.
 The slip arrangement can be either single slip or
double slip.
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Single Slip and Double Slip

11. Scissors Crossover
 A scissors crossover enables
transferring a vehicle from one
track to another track and vice
versa.
 It is provided where lack of space
does not permit the provision of
two separate crossovers.
 It consists of four pairs of switches,
six acute crossings, two obtuse
crossings, check rails, etc.
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Scissors Crossover

12. Triangle
 The triangle is a junction of a
railway track, which is constructed
for changing the direction of
engines.
 They require a large area and
therefore they are constructed
where there is enough land
available for their construction.
 This is mainly used for turning the
faces of engines where the
provision of the turntable is costly.
 https://youtu.be/d3xSZnyW1jc
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Triangle

13. Advantages & Disadvantages
Advantages
 Reduce infrastructure cost.
 Flexibility in routing.
 Minimal land acquisition.
Disadvantages
 Limited capacity.
 Higher construction &
maintences cost.
 Limited compatability.
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14. CONCLUSION .

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THANK YOU