The twin-valve engines with koepe-system were kind of standard around here. After koepe-system prooved to be effective, older machines were replaced or at least older winding drums were replaced.
Here is a quite complete foto listing of the still existing winding-machines in germany (sorry site is in german but mainly pictures so it might be interesting anyway)
http://www.minister-achenbach.de/dam...rmaschine.html
Another one in recklinghausen:
http://www.maschinenmuseum.de/halle/Reck.htm
Another one in Bleicherode
http://www.maschinenmuseum.de/halle/Salzberg.htm
And a very late triple cylinder steam engine with 4.000 NHP unfortunately just one pic of this engine...
http://www.maschinenmuseum.de/halle/SALZB2.HTM
cheers
chris