The blockage is between the York and Normanton section of the track, via Castleford, with National Rail confirming that trains will not be running.
Disruption is currently expected until 12pm today (August 7).
A spokesperson for National Rail said: “A road traffic accident at a level crossing at Castleford means that all lines are blocked.
“As a result, trains running through this station may be cancelled.”
Services that run via Wakefield are not affected by this.
Northern tickets can be used at no extra cost on alternative Northern services between Knottingley and Leeds with TransPennine Express services unable to run in both directions.
Rail replacement transport has been requested.
