Can't speak for the NYC, but the PRR had a little used alternative route out the north end of Chicago Union Station during the early part of the 20th century. Not sure how long it lasted, but they went north from the station, turned west after a short run, then turned due south for a good distance before turning southeast toward Indiana. (Can't remember if this was the Panhandle Division entrance to CUS or another division?) Most likely what would have been used in emergency, despite the passengers waiting at Englewood to head east.
Chuck
