The Saint Mary's Branch
The line east of Bellefontaine was abandoned in 1937. West of Bellefontaine was in use until the 1970's. I am not sure exactly when it was abandoned. Jerry Taylor's "Sampling of Penn Central" has a photo of the weeds overtaking this line in the early 70's. He stated that the line was 10mph "brushcutter" service.
A small section of this line is still used in Wapak and goes underneath I-75.
Right on the remaining bit of track in Wapak, there is a NYC coach and an amtrak coach.