Old trams of Copenhagen, KS 437 from 1918, and of Düsseldorf, RBG 2412 from 1957, at Sporvejsmuseet Skjoldenæsholm in Denmark. RBG 2412 looks like when it was doing test runs in Copenhagen in 1957-1958.
<a href="//commons.wikimedia.org/wiki/User:Dannebrog_Spy" title="User:Dannebrog Spy">Leif Jørgensen</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>