David Benton wrote:They could trundle along at quite a decent clip, at least it seemed like it riding them.
Are these the ones that sound abit like a tractor , changing gears at fairly low speeds?.
In the late 1950s and later they were ubiquitous and found all over the system. I think there were several versions. They replaced various types of steam and were much cheaper to run than steam - as well as less polluting. They needed less labour, as one driver was enough at the front end, eliminating the second man (fireman). I can remember when they were introduced on the GW mainline to Paddington, and how much cleaner they were than the steam, both inside for the passengers and outside for all the neighbours. Of course as time passed and the engines emitted black smoke too Paddington still persisted nearly as polluted as before. They have nearly all been replaced by cleaner and more modern diesels, and now with electrics.