Edit:It happens on the journey mode after completing the Saturday special, it starts at Manchester Victoria and the service won’t continue as the loading passenger bar won’t start. Plus the signal at the end of the platform won’t change leaving you stranded at the station and doesn’t fix itself if you open and close the doors or restart the game or console.
What service is it exactly. What station is it at?? More information would be helpful. Would let others help if they came across the same problem and found a way to fix it. The more information you provide the easier it is for people especially the devs to reproduce the problem and see if it is a single user bug or if its a complete game bug.