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What does ‘Bo-Bo’ or ‘Co-Co’ mean?

20-06-2019

Diesel and electric locos' wheel arrangements are described using a system where the axles of a loco are counted, with powered axles being described using letters and the unpowered axles (if any) indicated by digits. A set of two independently powered axles on a bogie is indicated by ‘Bo’, and a set of three independently powered axles on a bogie is indicated by ‘Co’. Hence, a loco with two bogies, each having two separately powered axles is classified ‘Bo-Bo’; with three such bogies it would be ‘Bo-Bo-Bo’; with two bogies each with three powered axles it would be ‘Co-Co’. Sometimes locos have some leading or trailing unpowered axles too, so for instance a loco with two

What is the Absolute Block System of train working?

July 16, 2019

Absolute Block' refers to a system where the the track is considered to consist of a series of sections, such that when one train is occupying a section of track (the block section), no other train is allowed to enter that section. In addition, no train can enter an empty block section without first securing the permission of the station in

What systems does IR use for control and reporting of signals and related equipment?

July 16, 2019

Panel Interlocking or Route Relay Interlocking are common in most busy stations. Usually, with these the aspects of all signals and positions of trains in various track sections is shown on a control panel. The control circuits usually use underground cables along the track, and sometimes overhead cables. Trackside cables are not used much because

What other methods of communication with train crew are used on IR?

July 16, 2019

Handheld radios (walkie talkie sets) are widely used now (since the late 1990s) by train crew, yard crew, etc.). Some stations have transmitters allowing them to broadcast to all walkie talkies in the vicinity. Often, because of their higher power they are able to transmit to walkie talkie sets carried by crew that are farther away than the

Are there any in-cab signalling methods, ATP, etc. used by IR?

July 16, 2019

Some WAP / WAM models have in-cab AWS / ATS (auxiliary warning system, automatic train stop). AWS provides prior in-cab notification of distant or home signals that are displaying danger or 'on'. ATS provides for a locomotive to be brought to a halt in case it overshoots an 'on' signal that it should not have. This has been tried out on the

Does IR use automatic track-side hot-spot detectors, trailing equipment detectors, etc.?

July 16, 2019

IR does not appear to have begun using any hotspot detectors or trailing equipment detectors or other methods for automatic detection of mechanical problems in rolling stock, apart from some isolated experiments. Axle counters or track circuits are the primary means of ensuring that a section of track is clear - problems from broken or detached

Does IR use any other method of Last Vehicle Proving

July 16, 2019

Apart from axle counters or track circuits that indicate that a train has passed out of a section of track, in some places magnetic detectors are used for last vehicle proving. A permanent magnet suspended a few inches above the track from the last vehicle of a train passes right over a sensor which is positioned in the center of the track. The

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What does ‘Bo-Bo’ or ‘Co-Co’ mean?

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