The map location given is for the Darling Run parking lot, which has restrooms. It is 8 miles from the northern terminus.  

Pine Creek Rail Trail runs from Jersey Shore to Wellsboro Junction. It is groomed after significant snowfalls, with tracks set, as far south as Whitetail.  The northern terminus of the trail is at Butler Access Area, close to the Pag-Omar farm market. The first 7 miles of trail go through farmland and marshland, and often have less snow than the rest.

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.