Its area of operations was predominantly the routes in Germany's central mountains (Mittelgebirge); as a result the first 10 units were given a Riggenbach counter-pressure brake.
They were employed on the 1-in-10 Honau-Lichtenstein rack railway, 2.2 km long, which employed a Riggenbach-Klose rack system.
Riggenbach | Niklaus Wirth | St. Niklaus | Niklaus Riggenbach | Niklaus Leuenberger | Niklaus Meienberg | Niklaus Manuel Deutsch I, ''Demons Tormenting Antonius | Niklaus Gerber | André Niklaus |