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By law, if it is a true "interlocking", all home signals are to display the most restrictive indication, (stop). Only once a route has been "lined-up" either by an operator AT the interlocking, or a dispatcher hundreds of miles away, will a proceed signal be displayed for ONE route only. Some seldom-used lines will have what is referred to as an "automatic-interlocker", These can operate several ways. Most common, is the so called, "first-come-first-served" type. Approach circuts detect a train within the outer boundarys of the interlocker, and will line that route up. A few of the older installations will require a train to stop at the inner-most limits of the interlocker, a member of the crew will then activate a device, usually a switch key, or a button enclosed in a locked box. After a prescribed time delay, the mechanism will initiate the interlocking process, and a proceed indication will be displayed. <br /> On some real "backwaters" operations, maintenance expenses do not justify such equipment, and a simple stop board is employed. But, that is not a real interlocking. <br /> Hope this answers your question. <br /> Todd C.
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