>>1204119See:
>>1204120UP got through three generations of the locomotives. The prototype and the first two generations were all ~5000hp single carbody+tender setups with a B+B-B+B bogie arrangement.
The 3rd gen locomotives went to a new articulated (C-C)+(C-C) permanent A+B arrangement, in which the A-unit contained the cab and the auxiliary generator while the B unit contained an 8500 horsepower gas turrbine that to this day is the most powerful prime mover ever installed in a locomotive, producing 212,000 lbs of tractive effort from a complete setup that was over 200 feet long and weighed over 600 tons fully fueled. The engine ran un-muffled like a helicopter engine, was ear-splittingly loud, and had a tendency to launch 30 foot flames on startup.
Here's a 3rd gen GTEL with a 98 foot long, 6600 horsepower EMD DD40X for scale.
Union Pacific built 56 of them between the three generations and at one point they hauled 10% of the total freight volume. Only rising oil prices did them in.
