The NKP Tower was a mechanical interlocking tower until it closed. The tower was a two story brick structure.
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This view is looking west towards the tower, the track closest to the photographer is the NKP Track to CP Junction. The track heading left to right is the A&S track, the left track is to StL T&E Crossing and to the right is either to Lenox Tower or Granite City.
This view is looking north west direction down the A&S track to Granite City or Lenox Tower. You can see the Granite City Steel Blast Furnaces in the background. The C&NW train is heading to Madison Illinois.
This view is looking west towards the tower, the track closest to the photographer is the NKP Track.