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Also known as "field changing". You can read more about that here: - http://en.wikipedia.org/wiki/Diesel_locomotive Scroll down to "Propulsion system operation". It also covers "Back EMF", the phenomenon whereby a traction motor will start to act as a generator as it spins faster. This...

From a loco perspective, rather than a Unit: - On a loco, the loco main reservoir and the train main reservoir pipe are displayed either side of a duplex gauge. With a loco and coaches / wagons, you can run with no main res pipe without the brakes applying, i.e. as a single piped train...

And mine to be honest - and i used to sign it!!

Possibly a little picky, but it was Exmouth Junction, not Exmouth. Exmouth Junction is where the Exmouth line branches away from the main Exeter to Waterloo line. A surviving example of one of those modular platforms can be seen just a short distance from those old works, at Polsloe Bridge...

I'd do free o/t to be at the sharp end of that!!

Indeed they have, both in traffic pre-'82 on a number of BR-organised railtours and several times since they were plated for mainline running as preserved machines. Queen Napier to Oban. My lords sir!!

Correct - they form the leading part of the "roll bar" cage, part of which can also be seen through the side windows (the big steel bar) and which offers us some protection in the event of a crash or derailment. Allegedly.

Have you tried the National Archives at Kew in South West London? http://www.nationalarchives.gov.uk/ They have an incredible amount of historical documents relating to the railway, and i know they have a number (but far from complete set) of reports of accident investigations by HMRI and...

Whilst unloading at Rugeley PS in the last couple of weeks, every Pendo I've seen go by on the WCML has had its rear pantograph raised and the front one lowered, which I guess fits in with other reports here :)

Hello from a newbie :) I'm able to offer some information from an authoritative viewpoint as i work with the Class 70s. I'm not fully genned up though, and wont pretend to be, but i can tell you that most of them have worked up at least a few hundred miles (and a couple are into the...