At approx 1330 , Truck 50 was dispatched to assist Lancaster City Fire on a working house fire in the 600 blk of Rockland St. Units from Lancaster City Fire arrived with a working fire with people trapped. First in units made several rescues on arrival. The shift commander requested the working fire dispatch bring truck 50. Rescue 50 would of normally been due but was out of service. Truck 50 arrived and assisted with several tasks on the fire ground. The tower operated for approx 2 hrs before being released.