Window damage caused by falling objects from a passing train has caused delays to London Midland train services between Northampton and Birmingham.
The 12:45 from Northampton to Birmingham New Street was struck by loose objects from a freight train, which was travelling in the opposite direction.
Windows were damaged and the train had to be halted because it needs to be examined.
No injuries are being reported.
A spokesperson said: "We are trying to get bus services to Rugby, Northampton and Milton Keynes."
The spokesperson added the issue with the damaged train was likely to clear by 15:30, but that passengers should expect minor delays after due to train congestion on the railway track.