During the train chase it's obvious the train is speeding down a single main line well away from the station. In the next shot the train passes to the left of the ground camera, just leaving the house track next to the station. Also revealing the old pass track and other town structures in the background.
When Captain Neville and Miles are knife fighting in the train yard, Neville has stubble on his face. A short time later, Captain Neville goes to move Danny from the bank vault and he is clean shaven. A short time later, Captain Neville is outside the train preparing to leave and he once again has stubble.
Miles and Charlie are riding horses alongside the track and there are no trees adjacent to the tracks. After a camera angle change, as they approach the train there are trees next to the track where they would have been riding, making it impossible to ride there.
The Baldwin 4-6-0 Steam Engine #44 (Renumbered #47) is from the SC RR museum, This engine was designed to burn coal and would not run on wood as depicted in the show. The steam engine is currently not operational. Special effects were used so that the locomotive appeared as if under steam while pushed and pulled by a diesel locomotive.
In the show the train is powered by a steam locomotive, but when the train passes over the camera it clearly shows the pusher diesel. Notice the step boards, mu hoses, and the fuel tank.
After Charlie has been thrown from the train and is running beside the tracks, a lit streetlight can be seen in the background.
When the workers are fueling the train, the wood they load was clean-cut, clearly cut by a power saw which no longer existed.