Alan1310
Member
- Joined
- 21 Jan 2010
- Messages
- 187
hi does the class 91 have a stepped brake or is it lap/hold/apply/ i know thats prob not the way it is but any info would help cheers
As far as I am aware they are still capable of higher speeds. The pass/good switch is still in situ and works. As with most locos they also have a straight air brake which just brakes the loco (3 steps, release, lap and apply).
E&W Lucas are class 91s physically limited to 125 since the refurb?
I believe that some have had their traction motor field diverts modified, which would affect matters.
I know what the pass/goods switch is for I drove them for 7 years, I was just pointing out its there and still works.
They no longer have a safety case for running above 125, so physically no, but reality, yes.
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No diverts as such, the motors are SEPEX, so the fields are controlled steplessly. I vaguely recall a conversation about the field weakening which doesn't start until quite high up the speed range, so aid 140mph running.
My mention of TM fields is also from a half recalled conversation with someone who would have known in detail, and some time ago. Something done with high end field weakening on some of them IIRC.
Did they ever have a safety case for 125+? It's never been permitted in service, for the reason given above.
I know a man who will know, I'll see if I can get the full story!
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Yes, as built, they were trialled for 140mph running under flashing greens. GEC would have needed to provide proof that the vehicle was capable of operating under 140mph conditions. (Same for Met Camm with the Mk4s).
I knew about the trials, but never in service. HMRI blocked it, despite the flashing greens being set up on Stoke Bank.
Be interested to hear what you come back with.