|Wye Switches. Here is an original photo that I took of a Pennsylvania Railroad train at the Wye Switches in Duncansville, Pennsylvania, on 05 October 1964. Shown here (L to R) are PRR engines #2511, #9546-B, and #9686. #2511 is a GF-25 built by GE in 1962 and rated at 2,500 horsepower. #9546-B and #9686 are EH-15's built by EMD and rated at 1,500 horsepower each; the B-unit was built in 1948, but the A-unit was built in 1949. These three Diesels, two freight cars, PRR caboose #477781, and three ALCO helper engines have just arrived from Altoona and are now backing into the Hollidaysburg Yards as they pass WYE Tower.