"Jack Taylor" wrote in message
...

I can't offer an explanation but I had a similar experience last year on a
Bakerloo line train. I boarded at Piccadilly Circus to find that the
carriage reeked with a burning smell, a whole bank of seats were lifted
and
two engineers were intently watching the traction motor below. There were
a
lot of grinding and banging noises (unusual ones) coming from the wheelset
as we progressed towards Queen's Park.

I was surprised that the vehicle was in service. Had it been an overground
TOC then the vehicle would have been locked out of service, rather than
full
of after-show revellers on their way home, surrounding working engineers -
but then that's LUL for you!

You'd prefer the entire train to be withdrawn from service?