I was also caught out by this this week. I didn't check and turned up for a Barnsley train that didn't exist. Then the train I was on broke down between Wakefield and Barnsley. Then on the return journey the remaining hourly service which was still showing as running on realtimetrains and the trainline, was in fact also cancelled because it was the same broken down unit stuck in Barnsley station. So what should have been a quick trip turned into a five and a half hour marathon.
There were also a few late drivers etc putting spanners in the works last week as well. Fortunately back to normal now.