New to the forums here, but certainly not new to SDC. Worked on the train itself for several years up until fairly recently, and probably robbed a few of you there.
I did have to comment on a couple of things here:
3. A spare. If they run 3 trains daily you'll need more than just 2.
4. Obviously some reconfiguration will need to occur at the round house to house 5 engines.
5. Who says they'll all stay at SDC? Some could go to Wild Adventures or Stone Mountain
First, these engines are pretty much duplicates of the engines that they already have at SDC. They are a rare, rather unique engine type. They actually first started bidding and negotiating on these over 2 years ago when they weren't sure if they were going to get 76 up and running again or if they were going to do the massive overhaul and rebuild that they ended up doing.
One of the three engines that they got (yes, there are actually 3) is no longer working and will be used exclusively for parts. There is/was debate on another one of the engines as to whether they will use it for parts or or rebuild it to use in the park. There is at least one engine they are committed to reworking a bit to be used in the park on at least a semi-regular basis.
I highly doubt that they would move any of them to another park for the simple reason that the only park in the world that runs these particular types of engines is SDC, and the guys that work there know these engines inside and out.
Last, as for the number of trains they run. The ONLY time they run 2 trains is during Christmas. Period. There was a time in the long ago past that they would run 2 in summer, but that was in the days of the robber shack being where the Barn Swing is now. The park is no longer willing (and I'm not sure that it's able) to provide the massive amount of extra staffing it would require to run 2 trains in the summer, nor are the crowds really worth it except for a couple of days a year. Even running one train on a 20 minute schedule you'll almost never wait more than one train to get a ride.
To add a second train would require adding at least one more conductor, one more engineer (and really it would need to be 2 of each for breaks) and at least one or two more robbers, who are already crowded in their shack between trains. (and trust me, right now they don't have the staffing to even think about that, and haven't in a long time) This doesn't even think about needing to add microphone packs, chopping a short show down a couple of minutes more to make it fit the time schedules, added upkeep costs on the engines and cars, so forth. I won't even get into all of the safety procedures that would come up in summer, as there are some different procedures used at Christmas that you wouldn't be aware of unless you work on the train.
Plus there's the rather obvious fact that while they might have 5 engines (3 of which are ready to run) there are only 2 sets of passenger cars that can carry people. One set being the new cars they started building in 2011 and just recently finished and one set of old cars. The other old cars they replaced were all scrapped (notice at the wreck- that's one of them).
So the idea of three trains being on those tracks at the same time is, quite simply, never going to happen (unless the park is closed and the engineers are having some fun or doing safety/ maintenance checks)
Anyways, hope that helps give y'all a bit of info about what may or may not happen with those and changes it might make to the train.