Locomotive – 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

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What are some books that I can find on or related to Indian Railways?
July 17, 2019

Listed below are several books that you might find interesting, on the topics of railways in India. Not all of them are devoted entirely to India. Also note that the books listed here cover a large span of publication dates, with some books having been published over a hundred years ago. The information below may be somewhat out of date. The

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What is Project Unigauge
July 17, 2019

Historically, India has had many different railway gauges in different sections, and some sections have changed gauges (sometimes several times back and forth) depending on perceived economic and operational requirements. However, maintaining multiple gauges leads to inefficiencies at transshipment points, etc., so in recent years there's been a

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Do mixed-gauge tracks exist in India?
July 17, 2019

Mixed-gauge tracks do exist in several places in India, although with the ongoing 'Unigauge' project that is progressing at a frenetic pace, there are not as many now as there used to be earlier. A complete list would be hard to compose. Mostly, mixed-gauge tracks exist(ed) in areas where it is/was difficult to have multiple tracks (built-up

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What gauges are used in India?
July 17, 2019

This is now found all over the country, and all major passenger and freight routes are now broad gauge. This is the widest gauge in regular use anywhere in the world. (In the past, though, an 8' gauge was used in Oregon, USA, and a 7'¼" gauge was used for the Great Western Railway in the UK.) Outside India, the 5'6" gauge is found in Pakistan, a

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Have any marshalling yards been closed down?
July 17, 2019

Yes, many marshalling yards have been closed over the years, especially since the 1980s, with the move towards using block rakes that do not need to be broken up and re-classified all the time. A list of closed yards is given below. Central Railway Amla (BG) Agra Cantt (BG) Wardha (BG) Nishatpura (BG) Balharshah (BG) Bina (BG) Jabalpur

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Where are the important marshalling and stabling yards?
July 17, 2019

Most of the bigger stations that are junctions or termini for various routes have large yards for stabling and marshalling rakes. E.g., Chennai Central homes rakes for many trains originating from there. Pune has a fairly large yard, as does Ernakulam. The Juhi marshalling yard is pretty big as well. Mughalsarai is the biggest marshalling yard in

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