Passengers stuck on Bakerloo Line Tube for more than an hour
Passengers were stuck on an early morning Underground train in north-west London for more than an hour.
The Bakerloo Line train stalled in the Queen's Park area at 05:36 GMT and did not start moving again until 06:52 GMT.
Commuter Ben Davis told the BBC: "We've been stuck on the Tube in freezing temperatures at Queens Park on the Bakerloo Line for over an hour."
London Underground (LU) apologised to passengers and offered them a refund.
Mr Davis added: "The electricity has gone out and we don't know what's going on."
Peter McNaught, LU Operations Director, said: "Due to a signal failure in the Queens Park area there were severe delays on the Bakerloo line this morning.
"LU staff worked hard to resolve the situation as quickly as they possibly could.
"I would like to apologise to customers for the disruption this caused to their journeys, particularly to those customers who were on the stalled train."