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HO - Steam Loco Kits
PRR M1a Mountain 4-8-2

In 1930, 100 engines of class M-1a were developed. They were built by Juniata, Baldwin, and Lima. They were slightly heavier than the M-1's, and had Worthington feedwater heaters with the mixing chamber back of the stack. Two compressors were mounted on the left side. Ten M-1a's, along with twenty M-1's were used for passenger service.

In 1946, several M-1a locomotives were upgraded and re-classified M-1b. Some important changes made to the locomotive included a twenty pound increase in steam pressure to 270 pounds and installation of circulators in fireboxes, which increased heating surface by thirty-five square feet. These changes occurred after the locomotives were sixteen or more years old; consequently, their final years were spent hauling the heaviest loads of their lifetimes.

#100450 Locomotive & Tender Kit
#100460 Super Detail Kit (over 65 brass parts)
#100442 Painted Engineer & Fireman
#100443 Assembled Piping
#100416 Smoke Unit
#500435 Assembled Valve Gear
           
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Prototype 
Specifications		 Model 
Specifications
Cylinders 27" x 30"
Firebox 79-7/8" x 125-15/16"
Steam pressure 250 lbs.
Tractive force 64,550 lbs.
Weight of engine in working order 390,000 lbs.
Weight of engine on drive wheels 271,000 lbs.
Weight of engine on front trucks 59,000 lbs.
Weight of engine on trailing trucks 60,000 lbs.
Weight of tender 378,360 lbs.		 Length with Tender 15-1/4"
Height
Weight 2 lbs. 10 oz.
Minimum radius 22"
Power Bowser DC-71
Drivers 72"
Color Brunswick Green

To make Eight Wheel Tender:
purchase #7006 Trucks and screw onto tender.

 

Kit Photos

Assembly- Exploded View Drawings

Prototype Photos
   
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Photo 5 Photo 6 Photo 7 Photo 8
Photo 9 Photo 10 Photo 11 Photo 12
Photo 13 Photo 14