Tower Grove Interlocking was designed and planned by the Missouri Pacific and the St. Louis and San Francisco Railroad in 1903; it wasn’t till 1940 that the interlocking was placed in service. The tower was a small one story brick building; it housed a Union Switch and Signal type "UR" interlocking Machine. "UR" stood for Union Route; it was an all electric relay interlocking. The Union Route machine was a panel with a etched track diagram, there were entrance buttons and exit buttons by the home signals on the diagram. These were used to select the route you wished to clear. Around 1970 the Missouri Pacific Oak Hill Line was single tracked through the interlocking. In the early 1990's the interlocking was closed when the oak Hill line was arranged to connect to the now BN line. This eliminated the diamonds and a need for the interlocking. Missouri Pacific trains would now run on the BN line east until they got to Grand Avenue interlocking where they went back to their own trackage.
In this view your looking west down the Frisco tracks, the Missouri Pacific tracks are to the right. This photo was taken on May 9th 1958, note that the Frisco signals are of semaphore type and the Missouri Pacific are of US&S trilight type.
This view is standing at the tower looking east down the Frisco tracks. Taken on April 26th 1956, the Texas Special is approaching the tower with MKT Engine 132 in the lead. A eastbound is lined on the Frisco tracks which can be seen by the cleared semaphore behind the train.
This view is standing at the tower looking west down the Frisco tracks. Taken on April 26th 1956, the Texas Special just past the tower. A eastbound is lined on the Frisco tracks which can be seen by the cleared semaphore behind the train.
In this view a train is switching cars on the Frisco industrial spur. Taken on April 26th 1956 and looking southeast.
Looking west down the Missouri Pacific tracks and under Tower Grove Avenue.
This view is looking west at the Missouri Pacific tracks. Missouri Pacific engine 8010 is coming off the Oak Hill Line and appraching Tower Grove Station, taken April 26th 1956.
Missouri Pacific Engine 2001 has left the Tower Grove Station and heads south on the Oak Hill line. Taken April 26th 1956.