In message , Tom
Anderson writes

In particular, a bike at one of the car ends on a Tube train, where
there are single sliding doors and restricted space, would impede
access to the end doors for evacuation. Class 508 has only double
sliding doors.

Does that mean that if tube trains only had double doors, they could
carry bikes?

I thought the bike thing was to do with the need to be able to evacuate
out the ends. Does Merseyrail have tunnels where it's possible to go
out the sides instead?

The reason I've always been given is that they would impede evacuation
of the (tube) train in an emergency. The only was to evacuate a tube
train in a tunnel would be through the M (driver's cab out to the world)
and J (passenger saloon to driver's cab) doors. There's not a lot of
room to start with and a bike or two would make things really difficult.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)