An eastbound train fouls the Chicago & North Western crossing at
Merrillan.
In the 1980s, the Green Bay & Western would change crews at Merrillan,
which would involve stopping the train near the depot jointly owned by the GBW
and the Chicago & North Western.  
 Phil O'Keefe  took this photo in
June 1981 and he
commented:
  For some  reason, the GB&W crews always liked to foul the C&NW mainline during crew
  changes.  Back in the 1970s and '80s, there was an agent working in the depot and my friends and I would often go in there to talk trains while
waiting for the GB&W to come through.
"Diamond" is a railroading term for a crossing.

Phil O'Keefe  photo, June, 1981
This photo may not be reproduced without permission.