railway Flashcards
A CST-9 sleeper consists of
two inverted triangular pots on either side of rail seat
a central plate with a projected key and box on the top of plate
a tie bar and 4 cotters to connect two cast iron plates
a single two way key provided on the gauge side to hold the rail to sleeper
Charles Vignoles invented the flat footed rails in
1836
Minimum depth of ballast prescribed of B.G. trunk lines of Indian Railways, is
20~25 cm
25 cm on indiabix
Best ballast contains stones varying in size from
Minimum ballast size 19mm.
Maximum size 50.8 mm.
Distance between the inner rail and check rail provided on sharp curve, is
44 mm for BG and MG routes and 41 mm for NG routes.
Pot sleepers are in the form of
two bowls placed under each rail and connected together with a tie bar
A kink is made in stock rails, ahead of the toe of switch at a distance of
15 cm
Rails are bent to correct curvature if the degree of curve, is more than
3 degree other sources
4 degree indiabix
In India the rails are manufactured by
[A]. open hearth process
[B]. duplex process
A scissors cross-over consists of angles
four pairs of points, six acute angle crossings and two obtuse angle crossings
Wooden sleepers used on the girders of bridges, are generally made of
teak
Overall depth of a dog spike, is
120.6 mm
Maximum wheel base distance provided on Indian B.G. tracks
6.096 m
what are used to fix flat footed rails to the wooden sleepers
bearing plates
The quantity of stone ballast required per metre tangent length, is
BG = 1.11 m3
and
MG = .767. m3
The type of switch generally used for B.G. and M.G. tracks, is
Undercut switch: used for N.G track.
Overriding: For B.G & M.G track.
Straight cut: For bull-headed Rail.
For flat bottom sleepers, maximum size of ballast, is
For wooden sleeper 50mm. (indiabix)
For steel sleeper 40mm.
For RCC 25mm.
Width of the top portion of a flat footed, rail, is
66.77 mm
Minimum packing space provided between two sleepers, is between
the distance b/w the two sleepers at the joint is 30-35cm or to max 55cm, and rest of that up to 75cm
A scissors cross over consists of one diamond and _____ turnouts ?
4 turnouts
Heel divergency, the distance between the running faces of stock rail and gauge face of tongue rail, as recommended for Indian B.G. tracks, is
BG=135.
MG=119&.
NG=100.
Type of switch rails generally adopted for modern track, is
curved switch
By interchanging gibs and cotters of a pot sleeper, gauge may be slackened by
3.2 mm
Composite sleeper index determines
suitability of wodden sleepers
Composite sleeper index The composite sleeper index (CSI), which evolved from a combination of the properties of strength and hardness, is an index used to determine the suitability of a particular timber for use as a sleeper from the point of view of mechanical strength.
Indian Railways detects the rail flow by
Kraut Kramer Rail flow detector.
A wing rail is renewed or reconditioned if its maximum vertical wear is
9.5m
Monnier, the inventor of R.C.C., suggested the introduction of reinforced cement concert sleepers for the railways in
1877
Type of sleeper – Minimum CSI
Track sleeper – 783
Crossing sleeper – 1352
Bridge sleeper – 1455
If S and H are strength and hardness index of a timber at 12% moisture content, the composite sleeper index, is
(S+ 10.H ) / 20
In Indian railways, plate laying is usually done by
telescopic method
Maximum cant deficiency prescribed on Indian Board Gauge Railways, is
For upto 100 kmph.
Speed CD=7.6 cm &
for speed > 100 kmp CD=10 cm.
On Indian Railways standard length of rails for M.G. track, is
11.89 m
The standard dimensions of a wooden sleeper for M.G. railway track are
Bg - 2.75m25cm.13cM.
Mg - 1.83m20cm11cm.
Ng - 1.54m15cm.10cm.
To avoid the damage of nose of crossing, the wing rails are ramped so that nose of crossing remains at a lower level by
3 mm
Smitch diamond is provided if the angle of diamond is less than
6 degree
The distance between theoretical nose of crossing and actual nose of crossing for practical purposes, is
Nose thickness x cot α
Widening of gauge is provided if degree of the curve, is
more then 4.5°
Sand may be used as ballast for
cast iron sleepers
cast iron sleeper is
Cast iron sleeper, is
[A]. pot sleeper [B]. box sleeper [C]. Duplex sleeper [D]. plate sleeper all correct
On Indian Railways, angle of crossing between gauge faces of Vee, is generally calculated by
cole’s method
In a railway track, permissible gauge with tolerance under loaded condition, is
G + 1.5 mm
The lengths of the standard crossings in India for Broad gauge and Metre gauge tracks is same for
1 in 8.5 B.G. and, 1 in 12 M.G
On either side of the centre line of rails, a cant of 1 in 20 in the sleeper is provided for a distance of
175 mm
On Indian Railways, the approximate weight of a rail section is determined from the formula
weight of rail / axial load of locomotive = 1 / 510
Steel sleepers are
6 mm thick steel sheets with ends bent down
The check rails are placed opposite the crossing wrt nose of crossing
The check rails are placed opposite the crossing so that its two-third length is ahead of the nose of crossing
Staggered rail joints are generally provided
on curves
Bull headed rails are generally provided on
points and crossing
Length of stock rail ahead of the toe should be
Length of stock rail ahead of the toe should be a minimum of 1.65 m
For metal sleepers with rounded edges, maximum size of ballast, is
40mm
Check rails are provided on inner side of inner rails if sharpness of a B.G. curve, is more than
> 8°
Burnettising is done for the preservation of
wooden sleepers
For inspection and packing of ballast, each pot sleeper is provided with ____ holes
three holes
The effective bearing area of all types of sleepers, is
0.46 m2
Pick up the correct statement from the following:
A. An extra width of 7.5 cm ballast isprovided on outside a curve if track is laid with short welded rails
B. An extra width of 7.5 cm ballast isprovided on outside a curve sharper than 3° on B.G. and M.G. tracks
C. An extra width of 15 cm ballast is provided on each shoulder if the track is laid with welded rails
D. All the above.
Pick up the correct statement from the following:
A. An extra width of 7.5 cm ballast isprovided on outside a curve if track is laid with short welded rails
B. An extra width of 7.5 cm ballast isprovided on outside a curve sharper than 3° on B.G. and M.G. tracks
C. An extra width of 15 cm ballast is provided on each shoulder if the track is laid with welded rails
D. All the above.
For points and crossings, maximum size of ballast, is
25 mm
else
50 mm
If a is average number of peaks more than 10 mm of uneveness per kilometre, b is average number peaks more than 6 mm for gauge variation per kilometre and c is average number of peaks more than 2 mm twist per metre, then composite current recording index (Ic), as recommended by Indian Northern Railways, is
Ic = 40 - a - b - c/4
The standard width of ballast for M.G. track in Indian Railways, is kept
- 30 m
- 35 m for B.G.
- 8 m for N.G.
To prevent creep in rails, the steel sleepers are fixed with rails by clips, bolts and ____ keys
4
In Indian railways, the ratio of axle load and weight of rail, is
512
Minimum composite sleeper index for wooden sleepers used over bridge girders, is
1455
f the stock rails are B.H. rails, the type of switch generally provided, is
straight cut.
On B.G. tracks the distance of outer signal from station limit is kept
BG - 540m.
MG - 400m.
Fouling mark is 305m.
