The Crocodile Class Ce 6/8 locomotive was manufactured around a century ago, between 1919 and 1927. It was used by Swiss Federal Railways.
Wikipedia claims that
These locomotives were developed for pulling heavy goods trains on the steep tracks of the Gotthardbahn from Lucerne to Chiasso, including the Gotthard Tunnel.
Sadly, I can't Google up any photos or model numbers of cars it was actually pulling during that time. So, what cars was this locomotive really used with? Especially at the beginning of its service, in 1920s?
From the description, I understood it was made for tracks where conventional, rigid locomotives were either too weak, or too long. Thus, I expect not all cars in that era to be able to ride the same routes. If that assumption is wrong, I'll be glad to know too.