Union Pacific Big Boy Steam Locomotive

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Train Simulator2013 – Union Pacific Big Boy Union Pacific Big Boy Steam Locomotive

1 BACKGROUND ...... 2 2 ROLLING STOCK...... 3 2.1 Union Pacific Big Boy...... 3

3 SCENARIOS...... 3 3.1 Big Boy Intro ...... 3 3.2 Big Boy Local Work Granite to Cheyenne ...... 3 3.3 Big Boy on Sherman Hill Part 1 ...... 4 3.4 Big Boy on Sherman Hill Part 2 ...... 4 3.5 Big Boy working Laramie Cement ...... 4

4 ACKNOWLEDGEMENTS...... 5

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Train Simulator2013 – Union Pacific Big Boy

1 Background

Big Boy was the name of the Union Pacific Railroad's 4000-class 4-8-8-4 articulated steam locomotives, built between 1941 and 1944 by American Locomotive Company. 25 Big Boys were built in two groups. The first group, called "class 1", were built starting in 1941. The second group, "class 2", were built in 1944. The Big Boys were the only locomotives to have the 4-8-8-4 wheel arrangement, which combined two sets of eight driving wheels with a four-wheel leading truck for stability entering curves and a four-wheel trailing truck to support the large firebox.

The designers determined that to pull a 3600 ton train, a tractive effort of 135,000 lbs would be needed. The designers agreed upon the 4-8-8-4 design. Next, the horsepower and cylinder sizes were computed based on 300 psi boiler pressure. Although they weren't planning to pull these freight trains at 80 MPH, the DoRMS designed them for 80 MPH in order to have a sufficient factor of safety built into the design. What resulted is considered by many to be the most successful articulated steam locomotive ever built.

The last revenue freight pulled by a Big Boy was in July of 1959. Most were retired in 1961. The last one was retired in July of 1962. As late as September, 1962, there were still four operational Big Boys at Green River, WY.

Union Pacific Big Boy Specifications:

Total built 25 Max speed 80 mph (130 km/h) Length 132ft 9 1/4in (40.47 m) Weight 1,250,000 lb (566,990.5 kilograms) Tractive effort 135,375 lbf (602.18 kN) Fuel capacity 30 short tons (27.2 t), 22,000 US gal

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Train Simulator2013 – Union Pacific Big Boy

2 Rolling Stock

2.1 Union Pacific Big Boy

3 Scenarios

3.1 Big Boy Intro Learn how to drive the Union Pacific Big Boy in this introductory scenario.

• Type Standard Only • Duration 20 Minutes

3.2 Big Boy Local Work Granite to Cheyenne Special service Big Boys are helping out. Today you get to use one to pick up and haul some cars to Cheyenne.

• Type Standard and Career • Duration 60 Minutes

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Train Simulator2013 – Union Pacific Big Boy

3.3 Big Boy on Sherman Hill Part 1 Having a fuel shortage a few Big Boys were brought out of retirement to make a special cold storage run. This is a two part scenario using a double team of Big Boys to haul 18 refrigerator cars to Cheyenne.

• Type Standard and Career • Duration 70 Minutes

3.4 Big Boy on Sherman Hill Part 2 Continue taking a refrigerator consist to Cheyenne yard.

• Type Standard and Career • Duration 45 Minutes

3.5 Big Boy working Laramie Cement Haul cement hoppers to Laramie Cement. Then get the empties there and take them to Laramie yard.

• Type Standard Only • Duration 35 Minutes

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Train Simulator2013 – Union Pacific Big Boy

4 Acknowledgements The whole team at RailSimulator.com would like to thank the following people for their help in the testing and development of this add-on:

Bob Artim RS.com

We would also like to take this opportunity to thank the various online rail fan communities for their continued support and valued feedback.

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