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All Door Box Car
Box Car -40ft. 5486-series
Box Car -40ft Double Door Wood
Box Car -41' Hi-Cube
Box Car -40ft. 5241-series
Box Car -40ft. 12000-series
Box Car -40ft Metal 5238
Box Car -40ft PS-1
Box Car -40ft Rivarossi 5279
Box Car -40ft Wood-Sheathed
Box Car -50ft Combination Door
Box Car -50ft Double-Plug Door
Box Car -50ft Plug Door
Box Car -60ft Single Door
Box Car -Old Time
Bulkhead Flat Car
Caboose -Bay Window
Caboose -Extended Vision -Roco 5485
Caboose -Extended Vision -12000
Caboose -Old Time
Caboose -Old Time Drover's
Caboose -Standard Cupola
Caboose -Streamline Cupola
Calcium Carbide Car
Cattle Car -40ft. -1st Version
Cattle Car -40ft. -2nd Version Roco
Cattle Car -40ft. -3rd Version Hong Kong/Taiwan
Center Flow Hopper
Coil Car
Container Carrier
Covered Hopper -47ft.
Crane Car
Flat Car
Flat Car -Old Time
Flat Car with 2 Autos
Flat Car with Bridge Load
Flat Car with Boat Props
Flat Car with Cable Reels -Lima
Flat Car with Cable Reels
Flat Cars with Trailers
Flat Cars with Containers
Flat Cars -Specialty
Flat Car w/Truck Load
Flat Car -16 Wheel with Load
Flexi-Flow Hopper
Gondola -Old Time
Gondola -40ft
Gondola w/Load -40ft.
Gondola -50ft. Outside Braced
Gondola -50ft.
Gondola 50-foot -Hong Kong
Helium Carrier
Hopper Car -40ft Open
Hopper -50ft. Ribbed Side
Horse Car -Old Time
Log Car
Palace Stock Car
Pulpwood Car
Ore Car
Reefer -40ft Private Owner
Reefer -41ft
Reefer -50ft. Outside Braced
Reefer -50ft. Smooth Side
Reefer -50ft Thermo King
Stock Car -50ft.
Stock Car -Old Time
Tank Car -50ft. In-Transit Heated
Tank Car -Chemcial Tank 40ft.
Tank Car -Single Dome 5276
Tank Car -40ft.
Tank Car -40ft Three-Dome
Tank Car -40ft Six-Dome
Tank Car -62ft. Single-Dome
Tank Car -Old Time 6255
Tank Car -Old Time
Track Cleaning Car
Vinegar Car
Watermelon Car
Wreck Crane with Work Car
Wrecking Crane
Track Maintenance Car
Old Time Cars
U.S. Army Trains
Jumpin' GI Jeep
Action Cars
Operating Cars

AHM Atomic Energy Commission Hellium Car

Helium Carrier
Atomtic Energy Commission

Helium Carrier
Department of Mines

AHM New York Central Hellium Car

Helium Carrier
New York Central

Hellium Car

Helium Carrier
Southern Pacific

Helium Carrier
Union Pacific

Helium Carrier

From what information I've found AHM's Helium Car appears based on the American Car & Foundry prototype built at the Berwick, Pennsylvania plant in the mid-1950s. Early production Helium Cars included 1930-built GATX models, as well as some produced by Magor. Though AHM offered the car decorated for folks like Wabash and NYC, apparently the cars were exclusive to the U.S. Navy (USNX), U.S. Department of the Interior's Bureau of Mines (MHAX) and U.S. Atomic Engery Commission (ATMX). By the 1980s, all cars are reported in Bureau of Mines service and by 1996 the fleet was out of service.

I've seen them running on various railroads in the U.S., research suggests loads originated in the convergence of New Mexico, Oklahoma, and Texas Panhandle region served by Missouri Pacific, Santa Fe, and Rock Island. Loaded cars went to various U.S. government installations, including NASA's Cape Kennedy in Florida, Vandenberg AFB in California, Oak Ridge in Tennessee, and other points.

Prototype information for the car may be found in Ed Kaminski's book "American Car & Foundry" by Signature Press. Information regarding Santa Fe's helium operations is included in Stephen & Cynthia Priest's "Santa Fe Heritage" series of books from Paired Rail Publications.

Examples examined were built by Roco in Austria for AHM. Origin marks on the car's underframe include Austria in all caps and the small Roco logo of the time. Information researched suggestes the prototype length to be 45-feet, while AHM's model is 40-feet long. This short version may have been an economy attempt to allow for recycling an existing Roco underframe for this model.