I’ve heard that some locos have ‘cruise control’. What does this mean?

20-06-2019

I’ve heard that some locos have ‘cruise control’. What does this mean? Some locomotive classes such as the WAP-5 and WAP-7, as well as the WAG-9, have controls in the cab that can 'lock' the train to travel at a certain speed (the speed at the time the control or button is set). The button is known as the 'BPCS' button. The computerized loco controls then manage the tractive effort and braking effort and attempt to keep the speed to within +/- 2km/h of the desired speed. In this mode, the driver does not have to do anything further except to respond to the alerter system (see below) within the stipulated intervals, and to use the horn as appropriate. Older locomotives without

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What are the different levels or standards of interlocking that IR specifies for stations?
July 16, 2019

A Standard I interlocked station has mechanical interlocking. It also usually has just one running line and a loop line (and perhaps a couple of sidings). These are usually branch line stations. The points are worked by point levers situated near the points, and the signals are worked from interlocking frames in the signal cabin. Key locking (see

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What’s ‘interlocking’?
July 16, 2019

In order to ensure that the signalling system never provides unsafe (conflicting) signals and the points are not set for more than one train that might end up proceeding on to the same section of track and hence suffering a collision, various schemes have been developed to coordinate the settings of the points and the signals within the region

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What are the last-vehicle indications that IR uses?
July 16, 2019

The last vehicle of a train is supposed to carry a red lamp at the rear. Earlier, the requirement was for merely an oil lamp, which was often missing or very feeble. In recent years provision of an electric lamp has become more common (it is mandated in the rules). Last vehicle indications are of different types. A large 'X' is often seen painted

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What’s the ‘clearing point’ or ‘fouling point’ or ‘fouling mark’? What is ‘overlap’?
July 16, 2019

The clearing point is the point ahead of a stop signal up to which the track must be kept clear of obstructions in order for a train to be accepted from the rear of the signal. In most cases this is with reference to home or outer home signals guarding entrance to station limits from a block section. The distance from the stop signal to the

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What is ‘isolation’?
July 16, 2019

Isolation refers to methods of protecting one line from the adjacent lines, e.g., in the case of loop lines that branch out from the main line at a station. A train or any rolling stock that is stopped on one of the lines while another train is moving through on the adjacent line should be prevented from moving and running over the points to the

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What kinds of signalling and train working systems are in use in India?
July 16, 2019

The absolute block system is the most widespread method of train working on IR. The block sections may be handled manually or automatically, or by some combination of those. Some sections still use different forms of physical token systems such as the Neale's Ball Token instruments. Other than the block system some other special-purpose methods

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