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Northern Pacific Z-5 Yellowstone

TS 2018
Saturday, 10 February 2018
(5 Votes)

Northern Pacific Z-5 Yellowstone by Rudi Jaeger (RudiJaeger)

NP_BB_Z5_Yellowstone.zip - 21 MB

Repaint for the RSC Big Boy Pack

Northern Pacific Z-5 Yellowstone; 09 FEB 2018

Repaints by Rudi Jaeger, exclusively for the RSC Big Boy Pack available at the Steam Store. The actual Yellowstones were a 2-8-8-4 wheel arrangement, as opposed to the Big Boy's 4-8-8-4 design, so this repaint is intended only as a "stand-in" until a real Yellowstone might become availble.



A Northern Pacific Z-5 Yellowstone with matching tender, featuring dynamic historical numbers and markings. Credits and thanks to the respective developer (RailSimulator.com) for providing the original textures which served as the foundation for this repaint. Although a repainted Big Boy tender is included, I highly recommned using the "NP Worn" Berkshire Tender which is included in my A3 Northern Pack (RWA Library) as it has the three-axle trucks and the appearance is similar to the tenders used with the actual Yellowstones.



The first 2-8-8-4 Yellowstone was built in 1928 for the Northern Pacific Railroad by the American Locomotive Company, and began operation in March 1929. Eleven more Yellowstones, built by Baldwin Locomotive Works, were in operation by November, 1930. The Yellowstone fleet was assigned road numbers 5000 through 5011. At 128 feet long and 699,700 lbs, they were the largest locomotives in the world until the arrival of Union Pacific's Big Boy, over a decade later. 

While the Big Boys were built during WWII and were scrapped after only 5 to 10 years of service, the Yellowstones were in service for nearly thirty years. Despite weighing 63,000 lbs less than a Big Boy, the Yellowstones had more weight on their drivers, resulting in a slightly higher total tractive force than a Big Boy (140,000 pounds of force for the Yellowstone, versus 135,000 pounds for the Big Boy).

The Yellowstones primarily operated between Glendive, Montana, and Mandan, North Dakota, until assignment of diesel power in 1944. They were then used as helpers at Livingston and Helena, Montana. The Northern Pacific began scrapping the Yellowstone fleet in September 1953, resulting in no surviving examples upon completion in June 1957.



1. Transfer the Assets folder (from this zip file) into your main Railworks folder. 
2. Find the RSC Big Boy Pack file, "UnionPacificBigboyAssets.ap", located here: Railworks/Assets/RSC/BigboyPack01/

3. Open "UnionPacificBigboyAssets.ap" using the same program used to open this zip file, and go to "RailVehicles/Steam/BigBoy/Default/Engine" and copy the following "Geo" files:

BB Superstucture.GeoPcDx

Note: Holding the "Ctrl" key, you can left-click on each of the listed geo-files and simultaneously select them for copying.

Now paste the Geo files into the "Engine" folder of your Freshly installed NP Yellowstone located here:

4. Go back to the opened "UnionPacificBigboyAssets.ap" to "RailVehicles/Steam/BigBoy/Default/Tender" and copy-paste "BB_Tender_Coal.GeoPcDx" into the NP Tender folder:


Close the ap-file.

5. In the TS 2018 scenario builder/editor, select "RSC/BigBoyPack01" in the assets flyout panel (right-side of screen). Then look for the "NP Z5 Engine Front/Rear" and  "NP BB Tender" entries in the left-side assets-list to select the locomotive and tender repaints.

~ Mission complete.

Note: If you need an accompanying caboose for your freight consists, look for "NP_X200_Caboose" in the RWA library.

Disclaimer: These files are for your personal enjoyment and are not to be redistributed. This product shall remain freeware and is to be hosted exclusively by Railworks America. I am not responsible for any issues you may encounter after downloading the file; it is your responsibilty to follow the installation instructions to achieve a correct setup. I have tested/painted these files in free-roam scenario creation using the Montana Rail Link Route (by Zawal) and they work just fine. If for any reason you are having difficulties with the installation, please contact me at Railworks America, or seek guidance in the forum; there is also plenty of useful information available from the search function - please try that method first. Thanks!

I hope you will enjoy your new Z-5 Yellowstone!

~ Rudi

Please accept license agreement before downloading

Please remember even those this file is free, the author still has rights to the file. Be sure to read the readme that is enclosed for further copyright information and instructions to install the file.


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"IMPORTANT NOTICE. Everything on this site is user generated content designed for use with RailSimulator.com Limited’s train simulation products, including RailWorks 4: Train Simulator 2013, Train Simulator 2014 and Train Simulator 2015. RailSimulator.com Limited does not approve or endorse this user generated content and does not accept any liability or responsibility regarding it.

This user generated content has not been screened or tested by RailSimulator.com Limited. Accordingly, it may adversely affect your use of RailSimulator.com’s products. If you install this user generated content and it infringes the rules regarding user-generated content, RailSimulator.com Limited may choose to discontinue any support for that product which they may otherwise have provided.

The RailWorks EULA sets out in detail how user generated content may be used, which you can review further here: www.railsimulator.com/terms. In particular, this user generated content includes work which remains the intellectual property of RailSimulator.com Limited and which may not be rented, leased, sub-licensed, modified, adapted,copied, reproduced or redistributed without the permission of RailSimulator.com Limited."


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