| Union Pacific Railroad B23-7A 257 drilling the yard at Cotter, Arkansas on February 25, 1989, Kodachrome by Chuck Zeiler. A B23-7A is a 12 cylinder B23-7 with horsepower boosted to 250 per cylinder or 3,000 horsepower. In 1980 the MP ordered three B23-7A's (#'s 4667-4669 , later UP #'s 257-259) and tested them systemwide. The result was the GE model B30-7A, a B30-7 with a 12 cylinder FDL prime mover. They were not renumbered into the B30-7A series on the MP because they lacked Sentry Wheel Slip and had different engine governors. |