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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)
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.
Helpful? Yes No Funny
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!!!
Helpful? Yes No Funny
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.
Helpful? Yes No Funny
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...
Helpful? Yes No Funny
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.
Helpful? Yes No Funny
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.
Helpful? Yes No Funny
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.
Helpful? Yes No Funny
Most Helpful Reviews  Overall
10 of 11 people (91%) found this review helpful
Not Recommended
Posted: July 7, 2015
TThis review will be for the Union Pacific Challenger and Big Boy DLC. There is a litany of problems with both of these DLC packages. I will only touch on a few of the many issues.

1) There are some things that a steam locomotive has to have in order to be immersive; it must transport you to that special place where you believe that you are actually running a steam locomotive. Well….., these engines lack all of those things. Missing or broken features are many and are overwhelmingly immersion-breaking, and while these engines look like the prototypes in the academic sense, they lack many fine details. Rivets on the tender are rendered two-dimensionally. A lot of detail is missing from the tender trucks including spring-rigging, brake calipers/shoes, and brake cylinders. The headlights and tender lights do not work. Additionally, the classification lamps do not work. There are many pipes, rivets, auxiliary devices, and linkages that are missing. A prime example is the missing compensating levers (throttle reach lever on the engineer's side of the boiler). The cab interiors are just as bad, rendered in low resolution and poorly detailed. There are several missing pipes, levers, and gauges. The cab windows do not open. The roof vents do not open. The Cab signals do not work. There are no cab lights so it is pitch dark inside; all the better to hide the missing details. On the Big Boy DLC I purchased, the cab windows are obscured by a grey haze so I can't see the engineer or fireman.

2) The sounds are bad. The Challenger isn't as bad as the Big Boy, but that is not saying a lot. The chuffing of the Big Boy sound like someone using a plunger on a toilet; a kind of wheezing, squishy sound. Even worse is that the sounds for both locomotives were borrowed from two-cylindered locomotives, and poorly made ones at that. The problem with using this sound for the Big Boy and Challenger is that the Big Boy and Challenger are 4 cylindered simple articulated locomotives. Even if the poorly made two-cylindered effect didn’t sound like a dying water buffalo, a two cylindered engine chuffs 4 times per revolution of the driving wheels. By contrast, a simple articulated would have two different sets of cylinders each chuffing 4 times per revolution; they would get out of sync with one another causing a staccato rhythm, 8 chuffs total per revolution. In railroad vernacular this is called “hitting a double lick”. This sounds NOTHING AT ALL like a 2 cylindered locomotive. The Gtrax Cab Forward got this sound effect down perfectly; why DTG couldn't manage to do it for the Big Boy and Challenger is incomprehensible. Ditto for the whistle sounds, hissing steam, and the “clunking” of auxiliary devices, all of which are missing, bad quality or poorly synced. What DTG should have done was to get sound samples from the real Union Pacific Challenger #3985, using the samples for both the Challenger and the Big Boy. It would have worked beautifully, but I guess that would have been too easy to do.

3) My biggest deal-breaker when it comes to immersion with a steam locomotive is the lack of a fully functioning set of particle emitters to model the various steam and smoke exhausts on the locomotives in question. After all, if a steam locomotive isn’t steaming and smoking, it isn’t much of a steam locomotive is it? I have said it in other reviews; the smoke and steam effects of the Gtrax locomotives (SP GS-4, NKP S-2, SP&S E-1, SP Cab Forward) are practically the best in the game. Why they were not used on the Big Boy and Challenger is beyond comprehension, as it would have added immensely to the immersion of this DLC.

The smokestack exhaust looks far too thick and doesn’t dissipate the way real smoke does. Essentially it looks like a column of dirty cotton candy shooting up and out, fluffy and irregular. The emitters for the cylinder ♥♥♥♥♥ do not work. The emitters for the wheel sanders do not work. The emitters for the boiler safety valves do not work, and the emitters for the turbogenerators do not work. The emitters for the injectors and feedwater pump are not present/do not work. And there are no emitters for the stoker motor exhaust on the Big Boy ( a coal burning locomotive).

4) The performance of these locomotives is completely unrealistic. First off, the models possess far too much tractive effort, that is, low speed pulling power. While the Real Challengers and Big Boys were indeed powerful locomotives that could start and rapidly accelerate heavy trains, they didn’t accelerate to 80 mph in ten seconds.TOTALLY UNREALISTIC. On the other end of the spectrum, the horsepower curve is too weak. The real locomotives could sustain 40-60 mph speeds with heavy trains, effortlessly for hundreds of miles. These DLC engines,”run out of boiler” within a few seconds of high speed running and can’t run at all with any significant load behind them. They run out of steam and stall, forcing you to stop and build up steam again. COMPLETELY UNREALISTIC.

The only justifiable use for these locomotives is in “supporting roles” in other scenarios. For example, Elphaba makes at least two Workshop scenarios for the Smokebox F.E.F., Grain Rush ’57 and UP Overland Mail, that utilize the Challenger and Big Boy. They can be seen rolling by with their own trains; you don’t have time to notice their deficiencies because you are too busy running the F.E.F. Other than this, and similar scenario uses, I cannot understand why anyone would want this DLC.

Granted, if you were really desperate to own these, you could look for a third party software utility called Railworks Tools, donation ware that you can get here, . Additionally, the locomotive performance issues can be addressed by installing physics mods found at Railworks They are by a man who goes by the name of DtrainBNSF1 and can be found in the files section, under Accessories and Tools. Having said this, I feel most casual players don’t want to spend hours tracking down modding software and mods, learning to use and install them, only to fix some of the problems. This DLC should never have been released in it’s current form. If a game or DLC is broken, it’s broken, and no amount of tinkering is going to fix it.

Both the Challenger and Big Boy DLC were obvious “rush-jobs” cranked out without any thought to accuracy, realism, or quality control. These could possibly be the worst DLC offered for this game. The content creator who made the DLC and the people who made the release decision either didn’t like their jobs, or didn’t care about North American railroad history, both of which are bad news for a company that makes a “Train Simulator”. The decision to sell this DLC does a disservice to Dovetail Games, its other content creators who will be “tarred by the same brush”, the Train Simulator franchise, and two legendary locomotives that deserve better representation than this. My only hope is that Dovetail Games will rectify their mistake and build brand new models of both of these locomotives to the level of quality of the Smokebox F.E.F. Normally, if a DLC release is average in quality I will recommend a “buy” decision, with the qualifier that the purchaser wait for a sale. With this release however, I cannot countenance a purchase decision. The Challenger and Big Boy DLC are awful, and unless you are going to be using them as “scenery” in other scenarios, don’t buy them, period. This DLC is a TRAINWRECK, and this is coming from someone who loves North American steam locomotives and the Train Simulator game.

Final Rating: Red Block: Danger ahead. I wouldn’t buy this if I were you.
Was this review helpful? Yes No Funny
10 of 13 people (77%) found this review helpful
1 person found this review funny
Not Recommended
Posted: November 12, 2015

will redo this review when it is fixed
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6 of 7 people (86%) 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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7 of 9 people (78%) 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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4 of 4 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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4 of 4 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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5 of 6 people (83%) 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 5 people (80%) 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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2 of 2 people (100%) found this review helpful
Not Recommended
Posted: October 7, 2015
Dont buy it unless you want to loose money. The folloing doesnt work: The horn, bell, and key controls. There also is no sound file that comes with it. Im kind of Angered by the fact I wasted 20 buck on something that isnt complete.
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2 of 2 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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