Signal control circuits, selection through track relays or devices functioning as track relays and through signal mechanism contacts and time releases at automatic interlocking. Signal governing approach to home signal. Mechanical or electric locking or electric circuits requisites. Mechanical locking or same protection effected by circuits.įacing point lock or switch-and-lock movement. Track signaled for movements in both directions, requirements.īattery or power supply with respect to relay location.Įlectric lock on hand-operated switch control.Ĭontrol circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism. Hand operated crossover between main tracks protection. Signal governing movements over hand-operated switch. Time releases, timing relays and timing devices. Insulation resistance tests, wires in trunking and cables. Switch circuit controller or point detector. Semaphore or searchlight signal mechanism. Purpose of inspection and tests removal from service of relay or device failing to meet test requirements. Tagging of wires and interference of wires or tags with signal apparatus. Protection of insulated wire splice in underground wire. Open-wire transmission line clearance to other circuits. Signal wires on pole line and aerial cable. Semaphore signal arm clearance to other objects. Pipe for operating connections, requirements. Spring switch signal protection requirements.Įlectric lock, main track releasing circuit. Spring switch selection of signal control circuits through circuit controller. Spring switch signal protection where required. Selection of circuits through indicating or annunciating instruments.Įlectric locks, force drop type where required.Īdjustment, repair, or replacement of component. Operating characteristics of electromagnetic, electronic, or electrical apparatus. Hand-operated switch equipped with switch circuit controller.Ĭircuit controller operated by switch-and-lock movement. Interference with normal functioning of device.ĭesign of control circuits on closed circuit principle. Rules, Standards, and Instructions Governing the Installation, Inspection, Maintenance, and Repair of Signal and Train Control Systems, Devices, and AppliancesĪpplicability, minimum requirements, and penalties.
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