I've spent some time reviewing old fire brigade photos to see if I could identify the location based on the uniforms. Two things I've noticed so far:
1) Fire fighter uniforms of the period appear to all be the same at first glance, but a combination of small details actually make these uniforms somewhat unique; and
2) These men are awfully slender for fire fighters, especially of that period.
And the same can be said of that fire engine.
Unfortunately, neither observation has brought me any closer to the solution.
So... Europe?