 At its south end, the line intersected the Erie and Pittsburgh Branch and Mahoningtown Branch.When the New Castle Branch ended at Stoneboro, the PRR had trackage rights east along the New York Central Railroad's Stoneboro Branch to Oil City and the Allegheny Branch, Chautauqua Branch, and Salamanca Branch.The New Castle Branch (and the Wolf Creek Branch, a short spur of it) was the only part of the Western New York and Pennsylvania Railway operated by the Pennsylvania Company as part of the Lines West of Pittsburgh rather than by the Pennsylvania Railroad as part of the Lines East of Pittsburgh.