Re: Not IT-related
OK - the vast majority of diesel "Multiple Unit" trains on the UK network are direct drive, where they have lorry-style propshafts and automatic gearboxes.
Older electric trains on the other hand are of course powered by electic motors, which step like this. Newer trains with AC motors and digital power controls are more likely to increase power gradually by cutting power off and reapplying it at high frequencies.
Biting the hand that feeds IT
