Posted by: The Blog Presenter | February 10, 2008

Diesel Loco lowdown

By Dr Swaminathan

Diesel electric locos are most complex, challenging, most widely used power.  Almost 80% of traction in the world is diesel.

 First mainline diesels in 1920s

6000HP AC-AC TM locos in 90s.

Hermann Lemp is father of Diesel Locos. he developed the control technology, which brought about a major change.

Mostly, they are 4stroke, however, WDP/G-4 are 2 stroke.

Parts of the diesel loco explained. A brief mention of the main function of each of the parts with a schematic diagram of the loco with the parts differently coloured. The diagrams are similar to Sheeju Chandran’s WDM-2 interactive diagrams. If u have not seen that, just search at for Sheeju and you will be able to get that.

Inverters can be IGBT or GTO Thyristor. Heavy electronic/electric talk.

Cooling systems form an important part of the loco which is responsible for efficient performance.

Muffler present in most foreign locos to cut down the noise. Apu has a vote of thanx for the fact that Indian locos are not equipped with these. Long live the acoustics!

The platform, chassis and bogies along with the ‘ballast’ to add to the TE are discussed.

Compressor and air-brake mechanism talked about.

System engineering: vehicle dynamics, integration, configuration.

Typical notch table for diesel locos. Notch/Speed/HP/Time are the tabs under which data is maintained.

Trivia on diesels. Smoking, notching, turbocharger, DB, longest, heaviest, etc.. loads of trivia

Can u believe this? 7.353km long iron ore train with 682 cars, 8 GE made 6k HP diesel locos. 1lakh tonnes of ore!!!

 Ends this session with some Poochi special videos, of diesels notching up! Awesome.



  1. Oh No! What a miss it has been so far 😦

    Great blogging folks – Vrij and Ranga, looking forward to the quiz – any prizes for me for the right answers?

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