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Diamond Speed
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I don't recall using the word "interlocking". The words were "diamond crossing". <br /> <br /> A manually-controlled crossing (for the purposes of the gentleman's question) can and is also often protected on low-speed and branch lines by a locked gate and no signals except a red light/stop sign on the gate. Want to cross?? Unlock the gate, wait the allotted time, swing the gate across the other track and lock it, then go. Special Conditions in TT determine if you have to move the gate back when across and vary by site. <br /> <br />Then there is the IC interlocking in Memphis, down by the river where all the main lines cross--IC/CN, UP/SSW/RI, BNSF/SLSF. Not interlocked. NO ELECTRICAL SIGNALS, NO TOWER. Protected by a 4-way stop--LITERALLY. Stop boards (stop signs) on all tracks, with priority governed by the rules (1st one there goes). Just like at a 4-way highway intersection. Truly manual.
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