swt_passenger
Veteran Member
- Joined
- 7 Apr 2010
- Messages
- 34,274
I think the max speed reduction consisted of a sticker in each cab saying 'max speed 75mph' and very little else, as far as I know they still have the same 100mph gearing they had when they were built.
All we really have to go on about the 're-gearing proposal' is the extract from the Feb 2012 Modern Railways article that I posted in reply to your similar point in the 458 conversion thread back in June last year:
Being 5 cars they will only operate in pairs rather than 3 x 4 cars and that means we can allow each unit to draw more current for a bit more performance. [...] but with an increased load, more vehicles and more frequent stops the motors will be working a lot harder and getting a lot hotter. The low average speed means that the fan on the motor shaft will not pull in enough air to cool it on a warm day and we will see motors overheating. [...] we could disable regenerative braking to solve that but that wouldn't be environmentally friendly. So the best answer is to re-gear the units from their unnecessary 100 mph to 75 mph. This means the motor spins faster for a given track speed and stays comfortable despite its harder life.
http://www.railforums.co.uk/showpost.php?p=1482632&postcount=99
Like almost everyone here, I have no way of knowing if that actually got done, and there's been a lot of water under the bridge since Walmsley will have written that piece anyway...