This yard is NS' Gang Mills Yard which handles interchange traffic with the Wellsville & Corning (ex-NYC line southward) and LA&L's Bath & Hammondsport (ex-DL&W mainline northward). NS also operates the ex-NYC branch to interchange with the Finger Lakes Rwy near Seneca Lake.
Nine years a similar question was asked on the Trainorders website that led to many well-illustrated responses: http://www.trainorders.com/discussion/read.php?2,909607
And here's a more contemporary thread that discusses the interchange RR situation out of the yard: http://www.trainorders.com/discussion/r ... ?2,2505938
I think these are the NS locals that operate out of Gang Mills:
- H05 GANG MILLS - ADDISON, NY TURN
- H06 GANG MILLS - GENEVA TURN FINGER LAKES RWY INTERCHANGE
- H10 GANG MILLS - ELMIRA TURN (Note there are also a few locals out of Elmira that run to Owego, Binghamton, and Sayre/Ithaca)
- Hxx GANG MILLS - Painted Post for interchange with the Bath & Hammondsport RR