As I recently uploaded Erie Railroad papers, it seemed only appropriate that my next page would be their merger companion, The Delaware, Lackawanna & Western Railroad. See the complete page here: https://train-orders.com/TOUR/D/DLW/DLW.html Bangor, Pennsylvania:
They used a "staff" for clearance, kinda' like the NP did over Stampede Pass so you knew you were the only train allowed thru the tunnel.