A freight train has derailed in Sheffield, resulting in widespread disruption to services in the city.
Northern Rail said services had either been cancelled or were being diverted, with disruption lasting all day.
It said the “low speed derailment” happened “just north of Sheffield”, meaning trains are unable to run through the city.
Services run by CrossCountry, East Midlands Railway, Northern and Transpennine Express are affected.
Northern warned passengers that due to a lack of alternative road transport and the number of routes affected, passengers should not travel.
East Midlands Railway said buses were being sourced to shuttle people between Chesterfield and Sheffield.
Operator Cross Country said trains would not run between Derby and Leeds, and would be unable to call at Chesterfield, Sheffield or Wakefield Westgate.
Meanwhile, TransPennine Express services between Sheffield and Doncaster and Sheffield and Manchester Piccadilly have been replaced with buses.