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User reviews:
Mixed (40 reviews) - 52% of the 40 user reviews for this game are positive.
Release Date: Nov 23, 2012

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Downloadable Content

This content requires the base game Train Simulator 2017 on Steam in order to play.

Buy Union Pacific Big Boy Add-On

Packages that include this game

Buy Big Boy + Challenger Twin Pack

Includes 2 items: Train Simulator: Union Pacific Big Boy Loco Add-On, Train Simulator: Union Pacific Challenger Loco Add-On

Buy Train Simulator: SD40-2 Independence Collection

Includes 4 items: Train Simulator: SD40-2 Independence Loco Add-On, Train Simulator: Sherman Hill Route Add-On, Train Simulator: Union Pacific Big Boy Loco Add-On, Train Simulator: Union Pacific SD70Ace Loco Add-On

Buy Train Simulator: Steam Collection

Includes 6 items: Train Simulator: Class A4 Pacifics Loco Add-On, Train Simulator: LNER Class A3 ‘Flying Scotsman’ Loco Add-On, Train Simulator: Southern Pacific Cab Forward Loco Add-On, Train Simulator: Thompson Class B1 Loco Add-On, Train Simulator: Union Pacific Big Boy Loco Add-On, Train Simulator: Union Pacific Challenger Loco Add-On


Classics Range

The Classics Range features a selection of must-have products at value for money prices from the TS back catalogue.

See the entire Classics Range

About This Content

The Union Pacific Railroad’s Big Boy 4-8-8-4 steam locomotive is undoubtedly the beast of American railroading history, and this epitome of heavy haulage is now available for Train Simulator with a number of challenging scenarios for the Sherman Hill route.

In the early 1940s, Union Pacific Railroad (UP) sought to build a locomotive capable of hauling heavy freight trains across Wyoming without the need for double heading and helper operations over the 1.55% gradient of Sherman Hill and the Wasatch mountain region. Adaptations of the previous Challenger Class locomotives showed that larger fireboxes, longer boilers and more driving wheels achieved their aims. What followed was the monster Big Boy with its articulated wheel configuration, huge water tank and 68in (173cm) driving wheels.

In 1941, Alco Locomotive Works delivered 20 Big Boys and another five were put into service in 1944. Although rarely run at such a speed, the Big Boy was capable of an 80mph top speed and towards the end of their life were regularly hauling more than 4,000 tons up the Wasatch gradient unassisted. The last revenue service by a Big Boy was in July 1959 and eight of the original 25 locomotives have been preserved in the USA.

The Union Pacific Big Boy V2.0 is available for Train Simulator in the famous UP black livery with accurate locomotive simulation, detailed cab interior, full TSX effects, and new smoke and steam particle emitters.

The Sherman Hills Add-On (available separately) is required to play the scenarios included with this Add-On.


Five scenarios for the Sherman Hill route:

  • Big Boy Introduction
  • Big Boy Local Work Granite to Cheyenne
  • Big Boy on Sherman Hill Part 1
  • Big Boy on Sherman Hill Part 2
  • Big Boy working Laramie Cement
More scenarios are available on Steam Workshop online and in-game. Train Simulator’s Steam Workshop scenarios are free and easy to download, adding many more hours of exciting gameplay. With scenarios being added daily, why don’t you check it out now!

Click here for Steam Workshop scenarios.

Key Features

  • Union Pacific Big Boy in UP black livery
  • Fully detailed cab interior with working gauges, levers and dials, with new textures
  • Enhanced TSX effects, smoke and steam particle emitters
  • Quick Drive compatible

System Requirements

    • OS:Windows® Vista / 7 / 8
    • Processor:Processor: 2.8 GHz Core 2 Duo (3.2 GHz Core 2 Duo recommended), AMD Athlon MP (multiprocessor variant or comparable processors)
    • Memory:2 GB RAM
    • Graphics:512 MB with Pixel Shader 3.0 (AGP PCIe only)
    • DirectX®:9.0c
    • Hard Drive:6 GB HD space
    • Sound:Direct X 9.0c compatible
    • Other Requirements:Broadband Internet connection
    • Additional:Quicktime Player is required for playing the videos
    • Additional:Quicktime Player is required for playing the videos
Customer reviews
Customer Review system updated Sept. 2016! Learn more
Mixed (40 reviews)
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34 reviews match the filters above ( Mixed)
Most Helpful Reviews  In the past 30 days
2 of 2 people (100%) found this review helpful
Not Recommended
Posted: September 29
This loco...

Last year DTG updated the loco supposedly based on user feedback. The fixes were minor, such has correcting the headlight, giving it new chuff sounds, and some other graphical things on the freight cars that come with the loco.

Now for what they didn't fix or made worse. I'm about to get AVGN up in this business:

The boiler is "too happy"; it raises steam WAY to fast and if you're working hard up the hill there is no way to fill the boiler. Water goes in, but because of the overactive boiler it's gone in like 2 seconds and the boiler continues to deplete its water supply. Before long you're in danger of running dry. The only way to fill the boiler is to close the throttle all the way so that steam production is cut down enough for the injector to catch up to the boiler which slows you to a crawl in the meantime.

The engine is so powerful it's broken. No joke! In real life the Big Boys produced 135,375lbf. How much does it develop in Train Simulator? 190,000lbf! No convention steam engine in history has EVER developed that kind of tractive effort! That's more than a modern ES44AH, which is closer to 189,000lbf starting. It's absurd.
It's too slow. Back in the 40s ALCO designed the engine to travel at a maximum of 80mph in order to warrant incorporating certain safety features into the design that would prevent it from knocking itself to bits as it thrashed down the line. In Train Simulator the top speed i closer to 60mph. Now while in service dragging freight across the Wasatch they never made it to 80, but they were still CAPABLE of 80mph, and to make the locomotive slower than its prototype detracts from the realism even further than it already has.

Even when the tender is full of coal, the coal animation is so low that the engine constantly looks like it's going to run out of coal!

The screenshots above are misleading; cylinder ♥♥♥♥♥ don't work because in the simulation file they're set up as "automatedcylinder♥♥♥♥♥". This can easily be corrected by opening the simulation file and putting "eFalse" in the automatedcylindercock statement, but doing so makes it so that you can't use it in Career scenarios because the loco is considered modified and Steam thinks you're cheating by using the engine in the scenarios (not that they're worth playing anyway). Also the particle emittors for the turbocharger, safety valve, whistle, cylinder ♥♥♥♥♥, and sander are all present BUT DON'T WORK unless you go into the particles folder and in each corresponding file set the iParticleEmissioRollOffRate to 0 (for some reason it's set at 2). And like before if you implement said fix you can forget about using it in Carrer scenarios and publishing scenarios to the workshop. Better get used to seeing an engine with steam only coming out of the smoke stack.

Each of these issues were already problems before DTG updated the loco last year, and their update completely ignored all of these giant "elephant-in-the-room" sort of problems.
And then there's the scenarios. I don't play them. Here's why:
The scenarios are episodic and are set during the modern era. Now if they featured 4014 which is currently being restored to operating condition that'd be okay, but this pack was developed BEFORE Union Pacific reaquired 4014 for restoration. The premise of the scenarios is that Union Pacific is in the middle of a fuel crisis so they brought a bunch of Big Boys out of retirement. Here's what's wrong with this set-up, especially for a simulator:
1) There are only 8 Big Boys left. Would the addition of 8 very old steam engines REALLY turn the tide in a fuel crisis?
2) Each Big Boy is coal-burning, and time and time again UP has gone on record saying that they have no interest in running coal-burning steam locomotives. That's why 844 is oil-burning. That's why 3985 was converted to oil-burning. That's why 4014 is being converted to burn oil. I'll stop there.
3) The scenario writer(s) doesn't/don't seem to realize what goes into restoring a steam loco, making it seem like it's as easy as putting water in the boiler, firing it up and it's ready, but it's not that simple. Take 4014. UP had to go out and survey each of the 8 remaining Big Boys to determine which was in the best condition for restoration. Next it spent months negotiating with the Rail Giants museum in Pomona, CA before it could reaquire the engine. It then took several days of dragging it from California to Cheyenne at 25mph before they could start work. On top of this, it projects spending millions if not billions to essentially rebuild the whole thing from the ground up. The earliest date that we can hope to see 4014 on the rails again: 2020, which at the time called for about 5-6 years of rebuilding.
That's just 1 Big Boy. DO YOU SEE UP DOING THIS 8 DIFFERENT TIMES IN ORDER TO SOLVE A FUEL CRISIS???? What were they thinking? By the time they got one ready to go the crisis would probably have been over, making the whole effort POINTLESS.

All in all, it looks great cosmetically, but physically it's awful, and the complete disconnect from reality in the scenarios is frustrating and personally gives me no reason to play them. It's your choice whether or not you want to spend the $6.99 to buy it, but personally I think it needs to be pulled from the store for a second time and completely rebuilt in order to addess some of these issues.

I'm the guy that usually steps in when a critic gives a particularly harsh review of DLC and tries to defend the product, but this particular DLC has no defence that I can give it.
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Most Helpful Reviews  Overall
11 of 15 people (73%) found this review helpful
1 person found this review funny
Not Recommended
Posted: November 12, 2015

will redo this review when it is fixed
Was this review helpful? Yes No Funny
7 of 8 people (88%) found this review helpful
Posted: February 17, 2015
If you're looking for a highly realistic and challenging steamer, move on. That being said, it's the Big Boy, and still fun.
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8 of 10 people (80%) found this review helpful
1 person found this review funny
Not Recommended
Posted: March 5, 2015
I'm very disappointed with this add-on. The light doesn't work, the horn sound is really bad. The brake gauge of the HUD doesn't seem to work and I've not yet been able to see the steam pressure in the boiler going down. Cylinder ♥♥♥♥♥ don't seem to work either.
I wouldn't recommend to buy it until its fixed, unless at a very big discount.
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5 of 5 people (100%) found this review helpful
Not Recommended
Posted: November 10, 2015
Do I like this DLC ?
Yes, as a fan of the big boy but that's where it ends.

Why would I not recommend it if it's I just said I am a fan of it ?
Because I am not a fan of Dovetail Games! They know it's broken, they don't say anything in regards to it getting fixed, and it's really a poor thing to do when it was broken for people who don't even want to update to 2016.

Is there any other problems with the DLC ?
Yes! Some scenarios are almost impossible to complete! The headlights are a crapshoot on if they work in quick drive or not, and it's almost impossible to drive this train at night!


Should you buy this DLC ? Depends if you feel paying a company money for missing files you have to get from the community is worth this beast of a steamer. I say I don't recommend it because you shoudn't need to take files that people backed up before the 2016 update! So by all means if you don't mind going deep into the games directory and replacing files than yes it's a good DLC! But being able to be fixed doesn't justify DTG blatant disregard for DLC that's old that they break!
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5 of 5 people (100%) found this review helpful
Not Recommended
Posted: July 6, 2015
I've bought the Union Pacific Big Boy loco in 2012 as soon as it was released. On Railworks 3 (the old name of Train Simulator) it was amazing. I think it was my favourite add-on and I played a lot with it. It used to be very real, and moving 120 cars for hundreds miles with its power was an astonishing and rewarding challenge.

Time has passed and now, on Train Simulator 2015, this add-on is really disappointing. The first thing I did as soon as I tried it after 3 years, was to go to Steam shop and search for the real Big Boy addon, "This must be the cheap version, there must be the right one somewhere" I thought. But I was wrong, this was the only one available.

I think it's because of the new game engine of Train Simulator 2015, and because the add-on hasn't been updated, but now the Union Pacific Big Boy looks like the worst amatorial locomotive available in the whole game. Sound component is just ridiculous, the train moves like a toy one, and half of the original cockpit commands still works under Train Simulator 2015.

I'm still hoping for a new version, one updated to the new game engine, one that does justice to the magnitude of the real, glorious Big Boy.
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6 of 7 people (86%) found this review helpful
Posted: November 18, 2015
UPDATE 11-18-2015: Dovetail managed to get the sounds back and everything else that was wrong with her in one patch. Now I could recommend this awesome steam loco.

I orignally bought this steam locomotive for Train Simulator 2013 along with the Challanger. She doesn't have any sound, engine, whistle, bell. Updating this big beast would be nice since this is a 2012 add-on and now we're in TS2016 where the game is going to be in a new engine one day.
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4 of 4 people (100%) found this review helpful
Not Recommended
Posted: January 6
List of things that NEED to be fixed.
1. Injectors are as useful as a garden hose.
2. Constant blowing off even at regulator and cut-off.
3. Little coal in the tender.
4. Sounds are awful.
5. Brakes are pitiful.
6. No cylinder ♥♥♥♥ steam or noise.
In conclusion you may aswell take your $19.99 and eat it rater than buy this or Challenger.
DTG if you read this either fix/update Big Boy and Challenger or give it to Smokebox to work on as his FEF-3 makes Big Boy and Challenger look like they where made by a 10 year old.
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5 of 6 people (83%) found this review helpful
Posted: December 27, 2014
I love driving Steam-locs. Unfortunately the BB headlight doesn't work and the HUD information isn't the same as the the technical, Cylinder Cokcs doesn't work and Exhaust/Live-injectors aren't visably adjustable if even adjustable at all; had to use the HUD, to adjust water levels, which indicate a different percentage.

Completion of the CAREER-scenario "Big Boy on Sherman Hill Part 1 CS" is not possible due to AI trains collision at Hermosa. Train UP4774 starts moving on a completely different track as you approach, runs a red signal and then collides with a stationairy AI loco sitting in a sidingin Hermosa.

Unfortunately the BB DLC is really that broken, and my searching on the internet confirmed these issues have been known since 2013....

Dispite all that it's still a fantastic loc to drive, easy to maintain running even at the inclines.
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3 of 3 people (100%) found this review helpful
Not Recommended
Posted: October 14, 2015
Sounds do not work. No simulation of steam operation at all, push the reverser and throttle forward and run like a diesel. Does not seem to work with any scenarios any longer.

Do not buy.
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Recently Posted
Posted: September 12
Basically, if you want a cheap articulated engine you can run easily. This is the train for you. It's perfect for anybody who wants a steamer, but doesn't want to spend a lot of money. It's easy to run, which makes it great for newer players.

Bottom line: If you want it, get it. But don't expect anything special.
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silas1426/kick ass
Posted: March 13
a good locomotive but it could have been mor like the big boy 4-8-8-4
Helpful? Yes No Funny
Posted: February 19
Owned it for years. They made headlight work but no steam. i cant re buy it through steam. Someone needs to make a real great Big Boy! It deserves nothing but the best. This is far from it!!!
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cαρтαιn σρραι
Posted: December 26, 2015

I cannot believe I wasted my money on this broken piece of crap DLC!! I wanted to drive the Big Boy and THIS is what I get?

I might as well go back to TS2006... THAT game worked...
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Posted: December 19, 2015
The classic Union Pacific Big Boy is a great DLC if your intrested in and like Amreican steam engines. Also the horn is pretty nice too. I recomend this, espically if it is on sale.
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Posted: December 8, 2015
After the recent update, Big Boy became a lot better. Its major problems have been fixed. But it's still an old addon that should be cheaper. The point of choosing this one over more modern steam loco addons is doubtful. The loco's performance doesn't seem realistic (it hauls pretty much everything with ease), but I find driving it enjoyable.

Let me put it this way: If you would like to try this particular loco, go ahead and get it. There are no more gamebreaking suprises waiting. If you're just looking for a nice steam engine, then there might be better ones to choose first.
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Posted: November 22, 2015
big boy is realy cylinder ♥♥♥♥ smoke. the horn sounds like it came from a car.the cuff sound is aweful sounds like a car with a rod knock, the rsc big boy in 2015 was sweet.
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