Harlem Route Service: 787 GCT to Croton-Harmon Issue: Playee Train 787 gets held at a red signal just before Hudson River Bridge after Harlem station. Investigating the issue, the culprit seems to be AI Train 684 Southeast to GCT. This train is stopping on the north side of the bridge, right after the triangle junction. Subsequent AI services are held behind it. I decided to try to complete the service for 684. Initially, this worked in letting 787 continue its service and freed up the other southbound services. Trying to complete 684's service into GCT shows that this service does not get routed to Track 34 and ends up at a different terminating platform causing issues for services behind it.