Disruption on CrossCountry between York and Reading due to broken down train at Solihull.
Trains are being diverted via Coventry, extending journey times by up to 30 minutes.
Also affecting Chiltern Railways and London Midland services.
There is no estimate for a normal service.
More top news
New report says less than 60% of children in Middlesbrough and Hartlepool attend good or outstanding secondary schools
The 37-year-old woman was walking along a pathway at the end of Chiltern Gardens following a night out with family on Sunday November 29.
Temporary agreement reached with the government means the planned three-day strike has been called off