Railways Flashcards
To design a cross-over between parallel tracks, the required components are :
two switch points, two acute angle crossings and four check rails
Boxing of ballast is done
At the rails
Best ballast contains stones varying in size from
2 to 5cm
For holding a rail in position, no chairs are used for
flat footed rails
Distance between the inner rail and check rail provided on sharp curve, is
44 mm
Coal ash (or cinder) is used in initial stages of a new construction of railway for
wooden sleepers
Pot sleepers are in the form of
two bowls placed under each rail and connected together with a tie bar
Rails are bent to correct curvature if the degree of curve, is more than
4°
A scissors cross-over consists of
four pairs of points, six acute angle crossings and two obtuse angle crossings
To prevent percolation of water into form
Black cotton soil
Distance between inner faces of the flanges, is kept
slightly less than the gauge distance
Over all depth of dog spike
120.6 mm
The tread of wheels is provided an outward slope of
1 in 20
Bearing plates are used to fix
flat footed rails to the wooden sleepers
A welded rail joint is generally
Suspended
Arrangement made to divert the trains from one track to another, is known as
Turnout
At a rail joint, the ends of adjoining rails, are connected with a pair of fish plates and
4 fish bolts
For providing the required tilt of rails, adazing of wooden sleepers, is done for
flat footed rails
The overall length of a turn out is the distance between the end of stock rail and
heel of crossing
A scissors cross over consists of one diamond and
Four turnouts
Type of switch rails generally adopted for modern track, is
Curve switch
Composite sleeper index determines
suitability of wooden sleepers
The place where a railway line and a road cross each other at the same level, is known as
Level crossing
A triangle used for turning the face of locomotives, consists of
Two turnouts and one split
