Burgdorf-Thun-Bahn (BTB) 3-phase locomotive De 2/2 2 of 1899.
Burgdorf - Thun was electrified in 1899 with 3-phase dual overhead
wires (as the first mainline worldwide), in 1932 the railway was
converted to the usual 1-phase AC system and the 3-phase locomotives
retired.
Verkehrshaus der Schweiz, Luzern, 2003-02-11.
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photo: <a href="mailto:tbk@uncia.de">tobias b k&ouml;hler</a>