Reminds me of the lines from Smigel and Sroda in Poland. Those little Px48's can sure handle rough track well. Sroda was better kept trackwork, but I suspect that is because they draw more year-round tourism.
On the run from Smigel to Stare Bojanowo there are quite a few 10km/h curves. The trackwork is 80-100 lb standard gauge rail that is laid in place, not really bent to any degree, which makes the joints meet at interesting tangent angles. Defenetly have to be on your toes when running this...although sitting down was even better.
That track looks like even a Shay would hesitate to tread there!
(Although, probably due to the small drivers, exhaust rate sounds remarkably fast
for the pace the engines are moving at, similar to a Shay). I noticed that even when the engineer leaned on the whistle to scare the chickens off, they didn't particularly rush to get out of the engine's way!