Northern Rail say a road vehicle is blocking a line at Denby Dale causing severe disruption to trains.
Northern Rail have issued a travel update warning on severe disruption between Huddersfield and Sheffield due to a road vehicle blocking the line.
Reports say it is due to a push bike on the tracks, but this is not yet confirmed.
Train services running through the station may be cancelled, delayed or suspended and disruption is expected until 8:30pm tonight.
Road replacement transport is in place between Huddersfield and Barnsley, and other transport has been requested to help stranded passengers.
Emergency services and Network Rail staff are en-route to the site to assess the situation.
A further update will be sent once staff arrive on site.