Sorry guys, both wrong.
There was a version of the P-51 that got as far as a wind tunnel test model. It had a mid engine and a swept wing.
What else was novel about it?
Bruce

Maybe the atomic bomb? just guessing.
Gila Monster?No guesses on the beast that use or may still roam the desert near Gila Bend AZ???
Not a camel? I recall the Army experimented with using them, and some managed to escape and run wild.
You are correct, but if memory is correct the Army turned them loose as they did not work out very well.
A little more on trains.
Traction engines were only used on narrow gauge R/R'S. How narrow did the narrow gauge R/R get??
Modern diesel electric works on a similar principle. Brand name think "Shay".
steel wheels on steel rails does not provide very good traction. Gets worse if wet in ice conditions.
What did trains do to help over come the friction problem????
Maybe it has been posted but how many gallons of water does one inch of rainfall produce over one acre?
The geared locos were used mostly on narrow gauage logging RRs due to the steep grades.
Locos carried a tank of sand with nozzles pointed at the tracks just ahead of the driving wheels.
Harry K
27154.07