The map location given is for the Whitetail parking lot, which has portaloos. It is 3 miles from the southern terminus in Jersey Shore. 

Pine Creek Rail Trail runs from Wellsboro Junction to Jersey Shore. It is groomed after significant snowfalls, with tracks set, as far south as Whitetail.  

Tioga State Forest grooms from Wellsboro Junction to Rattlesnake Rock, and Tiadaghton State Forest grooms from Rattlesnake Rock to Whitetail.  Trail conditions are posted at:

Pine Creek RailTrail https://www.facebook.com/groups/PineCreekRailTrail/permalink/39696212230...  
Tioga SF https://www.facebook.com/Tioga-State-Forest-415132265242755
Tiadaghton SF https://www.facebook.com/Tiadaghton-State-Forest-119486088697

Map of parking lots and facilities They are also shown on Purple Lizard's Pine Creek map. 

Cross country ski gear can be rented from CS Sports in Wellsboro.