On 16th of February 2003 in Herne-Westhafen at workshop of WHE I found this locomotive. I was unable to solve the question what's "WLS". But the wisdom of trainspotters all over Europe would solve the riddle. You need a hint? No problem, of course: Built by Jung in Jungenthal as number 13289 in 1961.
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Photo by Arnim v. Herff (arnimvherff@uni-duisburg.de)