Timetable service 06:31 (train 508 North White Plains to GCT). M3 driven in August, clear weather. Service went as planned untill I got blocked at a red signal at Mount Vernon West Yard. Asked signaller for permission to pass. Got message ‘Denied. Your train appears to be off path’. Checked map. My train is not off path and there were no AI train blocking my path as far as I could see.
