Detailed view onto an instrument of the small tamping machine, seen in Sindorf
(on Cologne-Aachen) on 15 July 2001. I guess this shows how much the rail is
canted sidewards (Überhöhung).
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Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph Schmitz</a>