Some more info after talking with the conductor again today. While the kids researched how to start and run the locomotive, they did not know how to operate the service brake for it (as said, two separate braking systems). Seems they would notch up and down to get it to move and slow down enough that they could throw the reverser lever to change direction. The reverser was hanging from a chain (kind of a big no no) while the engines were tied down on the shop service track next to the yard tracks. As they moved the locomotives (all EMD GP38-2s) onto the yard tracks, they moved through the switches even though they were not lined for that movement. This ended up breaking the turnout rails where they connected to the moveable ties as the switch posts are locked and could not be thrown (lined) properly even if they tried. None of the C&P rails are signal or dispatch controlled and track warrants are only needed for CSX to operate into the Carolina Piedmont yard for interchange. CSX communicates with Jacksonville dispatch when they do this. Carolina Piedmont is a short line operated by Genesee and Wyoming, a large short-line owner/operator. Since only C&P trains are operated on the main line/yard, it is considered "dark territory" where no trackside signals operate train movements since only one train at one time is on any part of the 32 miles of their rails. All communication is done by two-way radio on a dedicated AAR channel, but only C&P communicates on it and there is no regional dispatch center they need to advise their movements with or seek permission (warrant/EC-1) to use their tracks.