This is a type of 4-6-0 steam locomotive built by the Mason Machine Works in 1867.
While Latham Cole makes a speech about the railroad, the engine was busy building the highest and longest wooden trestle bridge.
When John Reid and Tonto found the engine, it was busy collecting the purest of rare silver rocks.
When the locomotive leaves with Rebecca Reid and Danny, even Latham Cole and Tonto try to stop the train with a bird in the cage. The engineer told the railroad workers to come out of the tunnel as the train coupled up to the freight cars of the silver rocks. Later during a battle with the Indians, Butch Cavendish told the engineer to get the train moving and make the engine go faster to chase Tonto on a handcar.
When the Constitution idled at Promontory, Utah for the Transcontinental Railroad alongside another steam locomotive, the famous "Jupiter", Tonto climbed into the cab and stole the train as the Jupiter sped into pursuit of the Constitution.
When Rebecca Reid and Danny put on the brakes of the Constitution the train didn't fall off the bridge or derail.
After the Great Train Chase the Constitution made it back to the town to give John Reid a reward just before he was leaving the town.
After filming the movie the Constitution and the Jupiter were both donated to the Filmore and Western Railway were they are seen today in storage.
This is the only locomotive in the movie that helped build the railroad, and didn't derail.
The locomotive used to be on display at the gate of the Hollywood Studios at Disney California Adventure for the movie premiere that occurred on June 22, 2013.
The engine was used in a Advil commercial, heavily modified, but still retains some trademarks to identify it.
The engine is now being used as a train in the HBO show Westworld. The engine retains its side tanks and head lamp from the Advil commercial but is now painted in a red and black livery. In Westworld it is named the "Black Ridge Limited".
There's another steam locomotive in real life the has the name "The Constitution" Boston & Maine No. 3713 which is on display at Steamtown.
The Constitution strongly resembles Illinois Central Railroad #382, the very same locomotive that Casey Jones drove on that fateful night in 1900. Only difference is that the Constitution has a rounded top firebox instead of a square shaped Belpaire firebox like on the 382.
The Constitution was not the real engine at Promontory Point. That was Union Pacific 119.
The Constitution was featured in Disney INFINITY.
The Constitution made a cameo appearance in Coco. The engine retains the same appearance from "The Lone Ranger". In the movie the locomotive was sitting at the train station while Héctor and Ernesto de la Cruz are walking to the train station and Héctor die.