I guess concrete ties would explain being able to knock down the weeds and start running trains after 20 years without the rails turning over!
In googling Bromberger Wirsitzer Kreisbahn, I was able to glean a few interesting stats; at its' height, the system had 256km of railroad. In 1955 they handled
1,474,000 passengers and 256,000 tons of freight! I'm not sure if those are metric tons, but I'm pretty sure those 1.5 million passengers are standard people!
In the old days, engineers were taught to count the poles per minute to calculate their speed. I would think that impossible on this little pike.