Just looking at really old threads on here that contain train phrases, lol.
Silver Dollar City's whistle code is like this:
2 short blasts: release brakes, proceed forward
3 blasts: reverse
1 blast: acknowledgement when shoving backwards, conductor signal, etc
2 long blasts are used on most grade crossings on the FSDL route. The engineers like blowing their whistles in fancy ways, which may sound confusing to untrained ears.