An interior view at Tower 19 near Dallas (Texas) Union Terminal shows the track diagram (“model board”) of the territory controlled by the tower and some of the levers that controlled the switches and signals. This is an electro-pneumatic interlocking, in which switches are operated by compressed air. Historic American Engineering Record photo
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Remember that the Gulf, Colorado, and Santa Fe Railroad Interlocking Tower 19 is now part of the Museum of the American Railroad in Frisco, Texas…