Road transport has been ordered to run between Hednesford and Rugeley Trent Valley stations after West Midlands Rail was made aware of damage to overhead electric wires.
Services from Hednesford at 9.25am, 10.26am and every hour after have been cancelled.
A statement on the West Midlands Railway website said: "We've been told that we have damage to the overhead electric wires between Rugeley Trent Valley and Hednesford.
"Train services running through these stations may be cancelled or delayed.."
The website initially said disruption was expected to last until 10.45m, but this was subsequently pushed back to 2pm.
The statement continued: "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.
"Passengers between Rugby and Stafford are advised to travel via Birmingham New Street. We have ticket acceptance in place with Cross Country for Birmingham New Street, Nuneaton and Tamworth.
"Passengers for Atherstone will have 2x16-seaters shuttling between Tamworth and Nuneaton.
"We will also have some full size coaches to shuttle between Rugby and Nuneaton."
Work was still ongoing to rectify the damage at 11am.