Yes, I suppose this is the only bugged Scenario in the LIRR dlc. But I seen on Youtube that in the Pc version there is not "blocked" AI trains in our track... you can also coupled yor train with the 2 or 3 stuck AI trains that you meet along the line (to come back to Jamaica) but at about 1 miles from the Jamaica station (and with a train with more than 20 cars, lol!) you'll meet a red signal and you cant complete the Scenario (the same).