The Raven wrote:Though looking at Wikipedia the 08 has only 350hp? A BMW M3 has more power, or am I missing something?
I'm not entirely sure of the physics of it all, but it's all to do with how the power from the engine is transmitted to the axles. A BMW M3 is designed to send its power directly to the axles, via the transmission, at several thousands revs, hence high acceleration.
On a diesel-electric loco (such as an HST), the engine is there purely to turn the alternators/generators that produce electricity. The 08 is one of these locos - the engine simply turns the DC generator, which feeds its power to the DC traction motors. It is this system that gives the 08 its supreme pulling power. The engine does not need to rev quickly to turn the generator at the speeds necessary for the correct amount of electricity to be generated.
The 08s were fitted with English Electric 6KT engine, an in-line 6-cylinder engine , pictured here:
http://www.railwayscene.co.uk/image.php?imgref=524. Try fitting one of those in a BMW ...
The 6KT revs at between 600 and 680rpm, depending on which power setting is chosen. An HST engine revs at 1500rpm maximum (full power), but the ability to run at 125mph comes from how the power is fed to the axles - the DC traction motors, which each receive 2000v DC (four traction motors per train).
The BMW M3 may have the same power output as a 6KT, but I bet it can't produce the tractive effort required to pull three HSTs coupled together. So it's not all about power per se.
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