Railway historic staff records

Paul Burkhalter

Here’s a question that combines my two interests, Swiss railways and genealogy!
It is said that my great-grandfather worked for the railway at Le Bouveret VS. This would have been sometime between 1870 and his death in 1912. Would anyone be able to tell me if employment records survive from this period, and where? I have asked SBB Historic but they tell me they do not have staff records.
My French/German is not sufficient to look myself.
Many thanks.

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