Bakerloo is probably the worst line out of deep-level ones - old
stock, twisted tunnels, and no reversal points between Paddington and
Elephant & Castle. I'd imagine that it is very hard to regulate such
limited service (Paddington to Elephant & Castle) and probably in
opposite directions there was severe overcrowding. Also due to
disruption been very early - it might have been that most trains did
not make it to the separated section from the depot...