Trains between Leeds and York via Church Fenton, where the train derailed, will be cancelled or diverted.
This disruption is expected until the end of today.
Northern trains between York and Leeds via Church Fenton will start and end at Micklefield, not calling at York.
Customers travelling from York for stations towards Leeds are advised to board road transport from York. Customers travelling from Leeds to York are advised to board road transport or travel on TransPennine Express/CrossCountry services.
Customers travelling from Leeds and stations towards York are advised to board the train service to Micklefield and change for road transport to York. Staff are available at Micklefield to provide assistance.
Journey times will be extended by up to an hour.
The route from Leeds to York via Harrogate is not affected.
The 10.34am service from Scarborough to York has been cancelled. The 9.34am service to York and 11am service to Hull are currently running on time.