This biopic about the life and career of Charlie Chaplin starred Robert Downey Jr. 

As Charlie makes his journey west, we see a brief travel montage featuring a steam train. The engine appears to be Great Western #75, likely lifted from another film. Beginning in 1965 this retired locomotive was put to use in films in Colorado, until it was sold to the Heber Valley Railroad in Utah in 1999. 

As Chaplin brings Karno's traveling vaudeville act to Butte, MT he catches his first glimpse of the "flickers." Here, we see another mystery steam engine on display. 

Here we see more reused footage, this time of Dardanelle & Russellville #8 on the Sierra Railroad from The Gambler. Today this engine resides on display at the Nevada State RR Museum in Carson City. 

We see Chaplin disembark a Southern Pacific coach car and head toward Mack Sennett Studios, which was a set built on the existing ruins of the Sanitation Dairy on Old Telegraph Road in Fillmore, CA. The Fillmore & Western Railway was used for these scenes. Although it is difficult to make out, I believe the engine used was Great Western #51 - one of two steam locomotives they had running at the time. The S-D silo had become a bit of local landmark until it was torn down after a windstorm in 2021. 

GPS Coordinates: 34.407577, -118.941621

As Chaplin arrives at Pasadena to meet his brother Syd, he has actually come to the historic Santa Paula Depot at 200 N. 10th Street in Santa Paula, CA. The steam engine at the front of the train is Great Western RR #51. After seeing much film use in the 90s this engine was sold to private ownership in the early 2000s and now resides at the Hudson Terminal Railroad in Colorado. Not much more is known about its current state. Also in this scene is a Railway Express baggage car, and SP coaches #2242 & 2512. 

In an empty field in Bardsdale, CA (it appears to be on Los Angeles Ave. near Ventura Street), the film crew constructed a faithful recreation of Chaplin's iconic 2nd studio (actually located at 1416 North La Brea in Hollywood). Later in the film when he returns to the states, we catch a brief glimpse of the real thing (today owned by the Jim Henson Company).