West Midlands Railway said trains were running through the station at reduced speed this morning.
Disruption is expected to last until around 11.15am.
A post on West Midlands Railway's website said: "Due to a road vehicle colliding with a bridge at Lichfield City trains have to run at reduced speed.
"Train services running through this station may be delayed. Disruption is expected to last until around 11:15 today (23 January).
"We expect some of our trains to be affected by this incident. To see how this might affect you, please use the Live Departures & Arrivals or plan your journey using the National Rail Enquiries real-time journey planner."
Visit westmidlandsrailway.co.uk/#cross-city for further updates.