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The interlocking machine uses a matrix of bars in a row and column formation to prevent certain combinations of switch and signal positions to occur for any given selection. This helps prevent two trains from colliding. The red can, seen above, was used by the signal maintainers to remind the tower man that the function of that lever was out of service. |
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| IRS 501(c)(3) Public Benefit Corporation #77-0071257 | |||
