Character mistake: Engine #1206 is instructed to take the nearest siding upon hearing the news of the oncoming train. Frank does the maths and determines that they will not fit into that siding. He states the siding being 4011 feet between signals, with about 2500 of actual usable space. Engine #1206 with 25 cars would only equal 1580 feet, giving them more than enough room to clear in the first available siding.The average length of a railroad car is 60 feet. Even if the cars were considered "long", total 25 cars would have fit into that siding.
Character mistake: In the reporting of the scene where the Pennsylvania police shoot at the train trying to hit the red button that would stop the train, the report said they were firing shotguns. They were firing M16 rifles.
Suggested correction: Not necessarily. Some engines may not have a rear cab access (like Frank/Will's engine had). And even if the rescue engine did have a rear cab access 777's engine only had a side access stair which at the speed it was going is more difficult to climb over from the engine in front of it.
Actually 777's catwalk goes across the front, from side stair to side stair, but someone would have to leap over a rail or a chain to get onto it from the other engine. Why would there be stairs on the right side unless there was a catwalk to get to the door on the left side?