The steepest gradients are 10‰. Not too brutal, but enough for some acoustic spectacle even in the age of modern electrics: at the end of a downpour, I witnessed an uphill freight train pulled by a TRAXX loco: it was slowed down to around 30-40 km/h, and the loco (which was probably sanding heavily) made a loud noise of mixed low and high tones which you don't normally get to hear. (Of course, the same with one of Gölsdorf's steaming monsters would have been a much greater spectacle.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}