The Westinghouse J34-WE-36 engine on top of the Boxcar was used for improvement of the short-start capability.
The famous Boxcar head on with a good view o the retro fitted booster engine on the roof it gave extra lift off weight and power but was penalisedby the extra fuel it had to carry an overall gain ... (more)
Note the additional jet-engine throttle above the captain's seat.
additional jetengine trottle visible above the captain's seat
the 2nd of only 2 airworthy flying boxcars! [Canon-20D]