London Midland train managers on strike
Supervisors at one of the Midlands' key railway companies are taking industrial action.
Duty train crew managers at London Midland went on strike for 48 hours from 22:00 GMT in a row over a shorter working week.
The company said it was "disappointed" by the decision but it had drawn up contingency plans to keep services running.
The TSSA union said it had been "forced to take action".
'Keep services running'
The 22 duty managers are based at Birmingham, Worcester, Crewe and Bletchley.
Earlier Steve Coe, the union's assistant general secretary, said: "We would like to apologise in advance to passengers who may well find their services delayed and even cancelled, but we have been forced to take this action to get management to listen to us seriously."
He added a second 48-hour strike would take place on 6 March from 22:00 if the dispute is not settled.
Earlier a London Midland representative said: "We are disappointed that a small number of staff have chosen to take industrial action.
"Our focus is to keep services running for our passengers and we have good contingency plans in place to do this. We remain open to talks with TSSA to resolve this issue."