Chris,
That does sound possible. The engine is on a turntable lead, she is Superheated and can take-off like a drag racer, just like the real ones.
Most other 7-1/2" gauge engines out there would have bent their frames like pretzels after a fall like that. Those Berks are built tougher than most, and Jack build the pilot extra-strong as people not flagging their trains on curves is too common of an occurance.
If the engine was running the next day it couldn't have hurt it "too bad". Hopefully it's just cosmetic damage.
On full-size equipment I've seen safety valves down-steam of the superheaters to help alleviate such pressure spikes. The example that comes to mind are the Southern Pacifc 4-10-2s with their Bradford Front End Throttles.
Cheers,
Curtis F.