Big Thunder Mountain Railroad Backstory: The Full Legend of Barnabas T. Bullion and Tumbleweed

18 days ago in "Big Thunder Mountain Railroad"

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Big Thunder Mountain Railroad overview

Posted: Friday May 1, 2026 5:45pm ET by WDWMAGIC Staff

Big Thunder Mountain Railroad reopens at Magic Kingdom on May 3, 2026. Ahead of the return, Disney has shared a deeper look at the lore behind one of its most enduring attractions.

Big Thunder Mountain Railroad overview

Here's the full story.

Who is Barnabas T. Bullion?

Barnabas T. Bullion is the eldest son of a wealthy and powerful mining family. He received a land grant from the United States government giving him rights to the Western River Valley, including Thunder Mesa and Big Thunder Mountain, in the Great American Southwest.

Barnabas T. Bullion

Bullion founded the Big Thunder Mining Company in 1850, driven by an unrelenting belief that fortunes lay buried beneath the red rock. At first, the gold flowed freely. But as the mountain pushed back, the easy pickings dried up and miners were forced to dig deeper.

Strange things started happening. Machines failed. Cave-ins shut miners out of rich strikes. Thunder rumbled from deep inside the mountain.

Bullion is also a member of the Society of Explorers and Adventurers, a group established in the early 1500s to conduct research for the advancement of navigation and exploration. Other members include Lord Henry Mystic and Harrison Hightower III.

Barnabas T. Bullion Note Released Ahead of Big Thunder Reopening

The Town of Tumbleweed

Tumbleweed was once a flourishing boomtown built around the success of the Big Thunder Mining Company. It had a boarding house, a company store, a saloon, a jail, and several other establishments.

As the mines fell silent, Tumbleweed faded with them. Hardship and drought stacked the odds against the town, leaving streets coated in dust.

The town's latest hope comes in the form of Professor Cumulus Isobar, self-described "Rainmaker Extraordinaire and Purveyor of Magical Elixirs." His arrival has brought cautious optimism, with locals noting his presence has occasionally brought rain - though sometimes with flash flood results. Whether he is a miracle worker or a showman remains an open question.

What You'll See in the Queue

The attraction's queue winds through the Big Thunder Mining Offices on the second level before descending into the mine where the trains are kept.

Along the way you'll pass:

A "No Drinking, No Fighting, No Whistling, No Kidding" sign
A blown open safe
Bullion's land grant as signed by President James K. Polk
A portrait of Barnabas T. Bullion himself

The queue passes the Foreman's Post, operated by the mine's domineering watcher G. Willikers, along with the Fusing Cage, blasting machines, and ventilation services before reaching the loading area below.

The Ghost Trains

By the late 1800s, conditions inside Big Thunder Mountain have deteriorated. Cave-ins are happening more frequently. Miners are reporting strange whispers from deep within the mountain.

And the trains? They're rolling out of the station with no one at the controls.

The narrow-gauge engines run driverless at high speed along the track leading deep into the mountain. Guests brave enough to board will experience firsthand just how wild the wilderness can get.

Big Thunder Mountain Railroad overview

The Train Names

Big Thunder Mountain Railroad at Walt Disney World features several named trains:

U.B. Bold
U.R. Daring
U.R. Courageous
I.M. Brave
I.B. Hearty
I.M. Fearless

Reopening May 3

The refurbished Big Thunder Mountain Railroad features new track, new trains, refreshed animatronics, and a new Rainbow Caverns scene. The height requirement drops from 40 inches to 38 inches.

Disney describes the project as a "mountain-top to cavern-deep refurbishment" that preserves the ride's core experience while adding new storytelling layers.

Big Thunder Mountain Railroad reopens at Magic Kingdom on May 3, 2026.

New Big Thunder Mountain Concept Art

Discuss on the Forums

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Disone1 day ago

I actually agree with your wife. I saw chipping paint and bolts that in no way were new. I feel like the train cars are refurbished but not new.

Tom Morrow1 day ago

Question since I didn't follow this too closely - are the turns banked more than before? The train seemed to take them slightly faster than before, but with less lateral forces.

EricsBiscuit2 days ago

They are definitely not running all the trains they could be. Line moves very slow compared to before the refurb. Hopefully they get that fixed.

Tom Morrow5 days ago

Just rode it, did not watch any POVs beforehand. Definitely smoother, much appreciated that the lift hill anti-rollbacks are no longer ear piercing loud (though there is now loud audio on the first and third lift.) The double helix felt faster to me, the rest felt about the same speed. I actually didn't mind the slight roughness it had though and it feels less out of control now that its super smooth. The updated lift scenes and audio are nice, however I think the third lift could have used some sort of physical animation, it's all just sound and lighting changes. Overall it is an improvement and I'm glad it's back.

phillip96986 days ago

You are the only one confused on what was being referenced. It wasnt muddied for anyone else.

Delta-77 days ago

Has the ride done five train operations at all since reopening? All the POVs I've seen so far appear to show just four running at a time (also judging by the train returning to the same side of the station after a circuit).

gorillaball7 days ago

Please tell me this is tongue in cheek?

Nunu7 days ago

Just rode it. Definitely smoother and quieter, while still exciting. The new cushioning of the seats and sides are appreciated. Also the new rubbery material reduces sliding and banging against your ride companion. Didn't feel a speed reduction from how it was before. An overall improvement, imo.

MisterPenguin7 days ago

Applying the brake of a car is acceleration (negative). Hitting it harder because of a vehicle about to slam into you is jerk. The sudden front end collision causing a complete stop is jounce.

MisterPenguin7 days ago

You're getting close. Imagine the front of the train (we'll call it "A") cresting at the top of the hill. A is going at about 5 MPH. The last vehicle (we'll call "Z") is also going at 5 MPH being pulled halfway up the lift hill. As A goes over the crest, vehicles B and C also approach and start to go over the crest. Now, with A, B, and C over the crest, gravity pulls them down. They start accelerating. They get to 10 MPH, then 20 MPH. While that's happening, Z starts to crest at the same velocity of A, B, and C. First 10 MPH, then 20 MPH. When Z crests the hill, Z is going now as fast at A, B, and C, which are now going 40 MPH (gravity's acceleration makes things go faster and faster). So, now, Z starts the decline down the hill at 45 MPH. Z is not only subject to gravity, but is being pulled by the vehicles in the front. A, B, and C had gently crested the hill. Z, however, is being yoinked over it for some air time. Meanwhile, A, B, and C are no longer descending. The track has flattened out. They're on a straightaway at 45 MPH. Big deal. Cars go faster. But with Z being yanked over the crest and down the hill, Z has a different experience that *feels* faster because of the layout of the track (i.e., declining). Everything in motion stays in motion unless acted upon an outside force. But when things alter the course, it is felt as a force. When Z crests the hill, Z is going as fast as A, B, and C. But the change in direction of the tracks (in Z's case, going down) is such a force (or, sudden lack of force free-falling in zero G). While going at the same speed as A, B, and C; Z feels the forces differently because it's going down at 45 MPH, but A, B, and C are leveling out. Different forces. Same velocity. (BTW, physicists use "force" and "acceleration" interchangeably. So, when they say the Earth is accelerating us up, they mean the earth is applying a force upwards keeping us from sinking to the center of the Earth.)

osian7 days ago

There was an infamous Open University episode, called The Jerk and the Jounce, using various rides including Nemesis to illustrate velocity, the rate of change of ve!ocity (acceleration), the rate of change of acceleration (jerk) and the rate of change of jerk (jounce). I got my head around Jerk (which explains why something can be jerky - because it's a rapid change of acceleration) but I think I checked out on Jounce!

flynnibus7 days ago

Because 'acceleration' is generally misunderstood and poorly labeled by the lay. What gives you thrills on a coaster is the twisting, the turns, the air time, the dropping and climbing over hills. The lay talk about 'going fast' - but what the real thing is all that CHANGING direction is actually what is the thrill on coasters.. that's what gives you the G-forces, the air-time, the sensations. That's acceleration - a change in your direction and/or speed - not the speed itself. Speed on its own has no sensation besides wind resistance.. it's the sensation you get going past something at different speeds that gives you that rush. Like racing past a bolder that feels close to you.. it's because the bolder is basically not moving, and you are. And the lay use of the words are generally fine... except when someone is trying to quantify why the ride feels different and trying to use an inaccurate speed measurement to justify their belief. When a roller coaster gets significantly smoother, the amount of change you feel will decrease.. it will feel less intense because you're not being subjected to all those minor shifts. 10mph will feel really slow until someone slams on the brakes.. same thing, just exaggerated :)

osian7 days ago

Within the wheel bearings.

osian7 days ago

It's all the same thing, just a question of trying to describe it! We all know that the back doesn't travel faster than the front. Coasters are not faster at the back. This is impossible. But different people at the front and back will experience the same elements at different speeds, forces and times. But different elements and forces at the same times and speeds. What is impossible is different speeds or the same elements at the same times! When people say it feels faster at the back, that literally refers to speed only, so that's why I talked about speed. But they might be misidentifying more intense forces as increased speeds, or perhaps just lumping together all the feelings and labelling them as speed. 20mph around a tight corner, or an acceleration from 0 to 30mph in 2 seconds, will feel more intense than a constant 40mph along a straight section, but people may describe the former as feeling faster.