The Promontory Point scene was filmed at Cook's Ranch, the site of the now mostly destroyed Silverado Set, and took 11 days of filming. The reenactors can be seen as the Infantry and Cavalry Troops present at the Driving of the Golden Spike ceremony, so rudely interrupted by Dr. Loveless and his 80 foot mechanical spider. For the Malheureux Point scene, filmed outside Los Angeles, the reenactors portray General McGrath's troops, that are gunned down by Dr. Loveless' tank. The filming for this scene took 7 days shooting. They do significant research to learn about the time period that they portray, including clothing, weapons, customs and the history of the period itself.
Many reenactors own several images and some own dozens.
Reenactors were first used in a film project for the making of the Blue and the Grey in the early 1980's. Since then they have been involved with the majority of film projects that involve American Military History.