London Midland disruption: 25 services affected
A total of 25 London Midland services have been cancelled or disrupted because of a shortage of drivers.
Services affected include those between Lichfield and Redditch, Shrewsbury and Birmingham and the city and Wolverhampton.
London Midland said eight shifts were affected, which meant 25 of its 1,300 trains were subject to alteration.
London Midland has apologised for the timetable changes, which are set to last until 11 December.
"It takes well over a year to become a qualified train driver, but several of our trainees are now approaching the end of the course," the operator said.
"This along with a number of efficiencies will ensure the shortfall is addressed by mid-December."