Trains are one of the main traveling methods in the Old West and feature prominently in Red Dead Redemption 2, Red Dead Redemption and Red Dead Revolver.
Red Dead Redemption 2
Trains have made more than a few appearances in most of Red Dead Redemption 2's game trailers. Little is currently known about them, they are expected to work as a traveling method like they do in Red Dead Redemption. You can gain access to trains by upgrading the Van Der Linde Gang's camp which will give you the ability from your tent to access any location that you have previously visited in exchange of a fee. This will also show a cutscene of Arthur riding the train.
In true Wild West fashion, in Red Dead Redemption 2 it's possible to hijack trains, ring the bell and accelerate at will. Trains can also be robbed to make a quick buck.Hijacking trains, however, is considered as one of the most severely punishable crimes in Red Dead Redemption 2, and players may end up having to face not only lawmen but also law-abiding NPCs.
Red Dead Redemption
Trains are one of the main transportation methods in Red Dead Redemption. The game features two different train lines, which require a full day to travel from one end to another. The Red Line covers New Austin and Nuevo Paraíso, reaching Armadillo, Benedict Point, Chuparosa, Las Hermanas, Casa Madrugada and MacFarlane's Ranch along the way. The second line, the Blue Line, covers West Elizabeth and Hennigan's Stead, stopping at Blackwater, Manzanita Post, MacFarlane's Ranch and the Pacific Union R.R. Camp along the way.
Trains are also the main focus of several story missions, which feature different trains than the ones used to travel. Even during story missions, trains can never be hijacked, only boarded at stations or from horseback.
Red Dead Revolver
Lacking the open-world experience of Red Dead Redemption 2 and Red Dead Redemption, trains do not act as a transportation method in Red Dead Revolver. They are simply the main setting for several missions, the first being The Traincar mission and the last being End of the Line.
There are some inaccuracies regarding trains in Red Dead Redemption, not counting the trains being available at all times. Locomotives in Red Dead Redemption are fuelled by wood, but by the early 1900s, they should be powered by coal, which was the main fuel for trains in that era. Trains in Red Dead Redemption are manned by a single driver, but it shouldn't be the case, as trains of the era required two different persons, a fireman who took care of the fuel, and an engineer, who kept an eye on speed and valves.