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Big Boy  LokSound V4.0 European Soundfiles H0 N XL L M4

With a total weight of 548,3t and a power of 6.290 HP (@48 km/h) the Union Pacific Railroad (UP) class 4000 locomotives (well know as "Big Boy") is one of the most powerful steam locomotives on the world. The American Locomotive Company (ALCO) built a total of 25 units between 1941 and 1944. At a maximum speed of 112 km/h (70mph) the Big boy is also the fastest articulated steam engine at all.

UP 4-8-8-4 Big Boy  LokSound 5 North American & Australian factory Equipped Sound files N XL L M4

Equipped with ESU "FULL THROTTLE STEAM" features!

During the late 1930s, the Union Pacific often used helpers to move trains from Ogden to Wasatch. The UP wanted to simplify this move so they asked their "Department of Research and Mechanical Standards" (DoRMS) to design a locomotive that could pull a 3600 ton train unassisted over the 1.14% grade of the Wasatch.
The designers determined that to pull a 3600 ton train, a tractive effort of 135,000 lbs would be needed. Assuming a factor of more…

Big Boy 4-8-8-4  LokSound Select Retail Soundfiles H0 N XL L M4

During the late 1930s, the Union Pacific often used helpers to move trains from Ogden to Wasatch. The UP wanted to simplify this move so they asked their "Department of Research and Mechanical Standards" (DoRMS) to design a locomotive that could pull a 3600 ton train unassisted over the 1.14% grade of the Wasatch.
The designers determined that to pull a 3600 ton train, a tractive effort of 135,000 lbs would be needed. Assuming a factor of adhesion of 4.0, the weight on drivers would have to be more…

UP Big Boy  LokSound V4.0 American & Australian Sound files H0 N XL L M4

During the late 1930s, the Union Pacific often used helpers to move trains from Ogden to Wasatch. The UP wanted to simplify this move so they asked their "Department of Research and Mechanical Standards" (DoRMS) to design a locomotive that could pull a 3600 ton train unassisted over the 1.14% grade of the Wasatch.
The designers determined that to pull a 3600 ton train, a tractive effort of 135,000 lbs would be needed. Assuming a factor of adhesion of 4.0, the weight on drivers would have to be more…

UP 4-8-8-4 Big Boy  LokSound 5 North American and Australian Sound files N XL L M4

Equipped with ESU "FULL THROTTLE STEAM" features!

During the late 1930s, the Union Pacific often used helpers to move trains from Ogden to Wasatch. The UP wanted to simplify this move so they asked their "Department of Research and Mechanical Standards" (DoRMS) to design a locomotive that could pull a 3600 ton train unassisted over the 1.14% grade of the Wasatch.
The designers determined that to pull a 3600 ton train, a tractive effort of 135,000 lbs would be needed. Assuming a factor of more…