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HO - Steam Loco Kits
PRR M1 Mountain 4-8-2

All loco kits, tender kits and superdetail kits are sold out and discontinued.
Most parts are available for repairing old locos.

The M-1 was a single prototype model 4-8-2 that was designed and produced by Juniata in 1923. This model was locomotive 4700, shop construction No. 3819. After two years of testing and road trials, the M-1 was approved for fleet construction.

M-1 designers, W. F. Kiesel, Jr. and J. T. Wallis transplanted features from the I-1s decapods. They allowed for a larger combustion chamber, but left most of the other features unchanged. Other items borrowed from the I-1s included the following: guides, crossheads, and various machinery parts. Some special features of the M-1's were: pilot deck-mounted air reservoir tank, 27" x 30" cylinders, 72-inch drivers, medium sized tenders, 250 pounds of boiler pressure, KW type trailing truck, Belpaire firebox, small steel cab, a total weight of 385,000 pounds, and could haul a load of up to 64,550 pounds.

The original engine was built with a very small tender and no mechanical stoker. It was hand fired, which led to great difficulties in handling this massive machine. Stokers and larger tenders were soon implemented.

Mountains were the first classes of superheated power to drop the "s" from class designation. All engines were superheated by this time, so the "s" was no longer needed.

"Mountains" are so-named because they were considered big and powerful for such work when first designed during World War I. These were considered to be the best steam locomotives the railroad ever owned; they replaced the Mikados, Decapods, and Santa Fe's. They became known as "the hallmark of Pennsy fast freight service".

#100430 Locomotive & Tender Kit
#100440 Super Detail Kit (over 70 brass parts)
#100442 Painted Engineer & Fireman
#100443 Assembled Piping
#100514 Operating headlight kit
#100416  Smoke Unit
#500435 Assembled Valve Gear
Click here for price Lists
Cylinders 27" x 30"
Firebox 125-15/16" x 79-7/8"
Steam pressure 250 lbs.
Tractive force 64,550 lbs.
Engine weight-working order 382,400 lbs.
Engine weight on lead truck 59,300 lbs.
Engine weight on drivers 266,500 lbs.
Engine weight on trailing trks. 56,600 lbs.
Weight of tender, loaded 217,900 lbs.

Length with Tender 12-3/8"
Weight 2 lbs 6 oz.
Minimum radius 22"
Power Bowser DC-71
Drivers 72"
Color Brunswick Green

Kit Photos

Assembly - Exploded View Drawings

Photos of Superdetailed Model

Photo 1 Photo 2 Photo 3 Photo 4
Photo 5 Photo 6 Photo 7 Photo 8
Photo 9 Photo10 Photo 11

Prototype Photos
Photo 1 Photo 2