Signal problems trigger train delays in Birmingham
A number of train services have been affected by signalling problems between Birmingham International and Birmingham New Street.
Network Rail said the operator London Midland was not running any trains between the two stations.
Virgin Trains, Cross Country and Arriva Trains Wales services were all also affected.
Network Rail tweeted lines have reopened but its website said delays were expected until 21:30 GMT.
Nick Dhanda tweeted: "The whole of #NewStreet is delayed!..it's going to be a long night!"
London Midland passengers were advised to use buses where ticket acceptance is available.Compensation claim reminder
Guy Dangerfield from Passenger Focus said: "Passengers should also be aware that they may be eligible for compensation for delays caused by these signalling problems.
"London Midland, Cross Country, and Arriva Trains Wales passengers can make a claim if they arrive more than 30 minutes late at their destinations, while passengers travelling with Virgin Trains can claim if they're delayed by more than 45 minutes.
"Different arrangements may apply for season ticket holders."
A spokesman from Network Rail said engineers had been on site welding and carrying out repairs.
He said: "The problem was at Proof House junction near Moor Street Station in Birmingham which was restricting the number of trains that are able to run."
There were also delays to services between Selly Oak and Walsall for Lichfield Trent Valley after a broken down train caused disruption at Aston and at University.
Trains running on various routes in and around the Birmingham area were delayed by up to an hour.