They also traveled on the B&O to Combo and onto the PRR which ran solid B&O hopper trains to Shippensburg, PA and then traveled on the Reading from there to Harrisburg using PRR engines and crews. I know because the first engine I ever remember getting in the cab was an emply B&O heading back to Combo Yard stopped at Pennroad Tower and the engineer let me and some friends into the cab. A-B-B-A set of F units. Wish I has wrote the numbers down. Engineer actually let us run forward and back about 50 yards blowing the horn the whole time.