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Why do locos sometimes use the rear pantograph and sometimes the front pantograph?

22-06-2019

There is in principle no difference between using the front and the rear pantographs for most locos as each is fully capable of delivering the required electric current from the catenary to the loco. (The AC-DC locos are special in that each loco is intended for a different traction supply.) Generally on IR there is no need for both pantographs to be raised at once since there are usually no unusual situations such as frost on the catenary or increased current collection requirements seen with other countries' railways. Yet, it is often seen that there are some definite patterns in pantograph usage. It has been the practice in many areas for locos to always have their rear pantographs up.

Which side does traffic run on the tracks in India?

July 17, 2019

Like road traffic, railway traffic is also on the left as a rule. The rule generally applies to all double-line sections, and a train moves on the right side tracks only in exceptional situations. Of course, it does not make any difference for single-line operations, and bidirectional movement is allowed on both tracks in the case of twin

Are there any special requirements for locos to work ghat sections?

July 17, 2019

Many locos can be used as bankers on ghat sections. Usually, goods locos are used for banking duties, although this is not a rigid rule. The leading loco on a ghat section can in general be any loco provided it has suitable braking systems, etc. There are some ghat special powers -- locomotives that are specially modified for duties on steep

How do the drivers in the leading loco(s) and the banker(s) communicate?

July 17, 2019

These days, it is more common for crew to be issued walkie-talkies, so communication is a bit less of a problem, but without them, coordinating the banking efforts with the leading loco always called for great skill and ingenuity. The drivers made use of horn signals, brakes, and also closely observed the load on the locomotives (by monitoring the

What are bankers? Why are bankers used?

July 17, 2019

A banker is a locomotive that assists in hauling a train up a steep gradient. A banker is attached to the rear of the train and pushes the train from the rear while the normal locomotive of the train pulls it as usual from the front. Bankers are used for two reasons. One is that, of course, the leading loco may need assistance on a steep

What are catch and slip sidings? How are runaway trains managed?

July 17, 2019

Catch sidings are sidings provided to divert runaway trains off the main line on approach to a station, or on steep downward slopes. Points are normally set to route all trains to the siding, which may end in a sand trap to slow down and halt any train that is moving too fast and out of control. This prevents runaways from entering station or yard

What happens when the Alarm Chain (Emergency Chain) is pulled in a coach? (ACP, Alarm Chain Pulling)

July 17, 2019

The alarm chain in a passenger coach is designed to create a break in the continuity of the brake pipes (whether vacuum or air brakes), immediately resulting in a loss of brake pressure (or vacuum) and thereby cause the train brakes to be applied. With vacuum brakes, a clappet valve is provided that is released by the pulling of the alarm chain,

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Why do locos sometimes use the rear pantograph and sometimes the front pantograph?

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