A popular postcard of the Brussels trolleybus, regardless of somewhat disagreeable foreground. I remember it was sold at the Brussels Transport Museum... about 20 years ago.

It was precisely at that time that a huge number of postcards were being issued for both trains and trams. Every museum, every publisher, published one or more series or themes. 20-30 years later, some of them are still available... As far as I know, there is only one publisher (in France) who still publishes new (and beautiful) postcards with trams.