after a series brief test runs following construction, the 60000 was sent to the pennsylvania railroad's altoona test plant in altoona, pennsylvania. placed on rollers without its tender, it was tested on the traction dynamometer to measure its performance, which included maximum drawbar horsepower. following tests at the altoona test plant, the pennsylvania railroad placed the engine in freight service between enola yard near harrisburg and morrisville yard via the trenton cutoff. during testing on the prr, 60000 pulled a maximum of 7,700 tons.