This is the oldest electric locomotive in Germany which is still
doing regular traffic. Since the "21" was delivered to the "Extertalbahn" 
(a private society) in 1927 it is working without interrupts or modifications. 
Its normal job is freight traffic, but the railway friends of this line 
have sometimes special occasions with historic passenger cars. 
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Photo taken from postcard (c)Verlag Jos. Grobbel