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683 Part 236—Rules, Standards, And Federal Railroad Administration, DOT Pt. 236 PART 236—RULES, STANDARDS, 236.56 Shunting sensitivity. 236.57 Shunt and fouling wires. AND INSTRUCTIONS GOVERNING 236.58 Turnout, fouling section. THE INSTALLATION, INSPECTION, 236.59 Insulated rail joints. MAINTENANCE, AND REPAIR OF 236.60 Switch shunting circuit; use re- SIGNAL AND TRAIN CONTROL stricted. SYSTEMS, DEVICES, AND APPLI- WIRES AND CABLES ANCES 236.71 Signal wires on pole line and aerial cable. Sec. 236.72 [Reserved] 236.0 Applicability, minimum requirements, 236.73 Open-wire transmission line; clear- and penalties. ance to other circuits. 236.74 Protection of insulated wire; splice in Subpart A—Rules and Instructions: All underground wire. Systems 236.75 [Reserved] 236.76 Tagging of wires and interference of GENERAL wires or tags with signal apparatus. 236.1 Plans, where kept. INSPECTIONS AND TESTS; ALL SYSTEMS 236.2 Grounds. 236.3 Locking of signal apparatus housings. 236.101 Purpose of inspection and tests; re- 236.4 Interference with normal functioning moval from service of relay or device of device. failing to meet test requirements. 236.5 Design of control circuits on closed 236.102 Semaphore or searchlight signal circuit principle. mechanism. 236.6 Hand-operated switch equipped with 236.103 Switch circuit controller or point switch circuit controller. detector. 236.7 Circuit controller operated by switch- 236.104 Shunt fouling circuit. and-lock movement. 236.105 Electric lock. 236.8 Operating characteristics of electro- 236.106 Relays. magnetic, electronic, or electrical appa- 236.107 Ground tests. ratus. 236.108 Insulation resistance tests, wires in 236.9 Selection of circuits through indi- trunking and cables. cating or annunciating instruments. 236.109 Time releases, timing relays and 236.10 Electric locks, force drop type; where timing devices. required. 236.110 Results of tests. 236.11 Adjustment, repair, or replacement of component. Subpart B—Automatic Block Signal 236.12 Spring switch signal protection; Systems where required. 236.13 Spring switch; selection of signal con- STANDARDS trol circuits through circuit controller. 236.201 Track-circuit control of signals. 236.14 Spring switch signal protection; re- 236.202 Signal governing movements over quirements. hand-operated switch. 236.15 Timetable instructions. 236.203 Hand operated crossover between 236.16 Electric lock, main track releasing main tracks; protection. circuit. 236.204 Track signaled for movements in 236.17 Pipe for operating connections, re- both directions, requirements. quirements. 236.205 Signal control circuits; require- 236.18 Software management control plan. ments. 236.206 Battery or power supply with respect OADWAY SIGNALS AND CAB SIGNALS R to relay; location. 236.21 Location of roadway signals. 236.207 Electric lock on hand-operated 236.22 Semaphore signal arm; clearance to switch; control. other objects. 236.23 Aspects and indications. Subpart C—Interlocking 236.24 Spacing of roadway signals. 236.25 [Reserved] STANDARDS 236.26 Buffing device, maintenance. 236.301 Where signals shall be provided. 236.302 Track circuits and route locking. TRACK CIRCUITS 236.303 Control circuits for signals, selec- 236.51 Track circuit requirements. tion through circuit controller operated 236.52 Relayed cut-section. by switch points or by switch locking 236.53 Track circuit feed at grade crossing. mechanism. 236.54 Minimum length of track circuit. 236.304 Mechanical locking or same protec- 236.55 Dead section; maximum length. tion effected by circuits. 683 VerDate Mar<15>2010 14:14 Nov 15, 2011 Jkt 223217 PO 00000 Frm 00693 Fmt 8010 Sfmt 8010 Q:\49\49V4.TXT ofr150 PsN: PC150 Pt. 236 49 CFR Ch. II (10–1–11 Edition) 236.305 Approach or time locking. Subpart D—Traffic Control Systems 236.306 Facing point lock or switch-and-lock movement. STANDARDS 236.307 Indication locking. 236.401 Automatic block signal system and 236.308 Mechanical or electric locking or interlocking standards applicable to traf- electric circuits; requisites. fic control systems. 236.309 Loss of shunt protection; where re- 236.402 Signals controlled by track circuits quired. and control operator. 236.310 Signal governing approach to home 236.403 Signals at controlled point. signal. 236.404 Signals at adjacent control points. 236.311 Signal control circuits, selection 236.405 Track signaled for movements in through track relays or devices func- both directions, change of direction of tioning as track relays and through sig- traffic. nal mechanism contacts and time re- 236.406 [Reserved] leases at automatic interlocking. 236.407 Approach or time locking; where re- 236.312 Movable bridge, interlocking of sig- quired. nal appliances with bridge devices. 236.408 Route locking. 236.313 [Reserved] 236.409 [Reserved] 236.314 Electric lock for hand-operated 236.410 Locking, hand-operated switch; re- switch or derail. quirements. RULES AND INSTRUCTIONS RULES AND INSTRUCTIONS 236.326 Mechanical locking removed or dis- 236.426 Interlocking rules and instructions arranged; requirement for permitting applicable to traffic control systems. train movements through interlocking. 236.327 Switch, movable-point frog or split- INSPECTION AND TESTS point derail. 236.476 Interlocking inspections and tests 236.328 Plunger of facing-point lock. applicable to traffic control systems. 236.329 Bolt lock. 236.330 Locking dog of switch-and-lock Subpart E—Automatic Train Stop, Train movement. 236.331–236.333 [Reserved] Control and Cab Signal Systems 236.334 Point detector. STANDARDS 236.335 Dogs, stops and trunnions of me- chanical locking. 236.501 Forestalling device and speed con- 236.336 Locking bed. trol. 236.337 Locking faces of mechanical lock- 236.502 Automatic brake application, initi- ing; fit. ation by restrictive block conditions 236.338 Mechanical locking required in ac- stopping distance in advance. cordance with locking sheet and dog 236.503 Automatic brake application; initi- chart. ation when predetermined rate of speed 236.339 Mechanical locking; maintenance re- exceeded. quirements. 236.504 Operation interconnected with auto- 236.340 Electromechanical interlocking ma- matic block-signal system. chine; locking between electrical and 236.505 Proper operative relation between mechanical levers. parts along roadway and parts on loco- 236.341 Latch shoes, rocker links, and motive. quandrants. 236.506 Release of brakes after automatic 236.342 Switch circuit controller. application. 236.507 Brake application; full service. INSPECTION AND TESTS 236.508 Interference with application of brakes by means of brake valve. 236.376 Mechanical locking. 236.509 Two or more locomotives coupled. 236.377 Approach locking. 236.510 [Reserved] 236.378 Time locking. 236.511 Cab signals controlled in accordance 236.379 Route locking. with block conditions stopping distance 236.380 Indication locking. in advance. 236.381 Traffic locking. 236.512 Cab signal indication when loco- 236.382 Switch obstruction test. motive enters block where restrictive 236.383 Valve locks, valves, and valve conditions obtain. magnets. 236.513 Audible indicator. 236.384 Cross protection. 236.514 Interconnection of cab signal system 236.385 [Reserved] with roadway signal system. 236.386 Restoring feature on power switches. 236.515 Visibility of cab signals. 236.387 Movable bridge locking. 236.516 Power supply. 684 VerDate Mar<15>2010 14:14 Nov 15, 2011 Jkt 223217 PO 00000 Frm 00694 Fmt 8010 Sfmt 8010 Q:\49\49V4.TXT ofr150 PsN: PC150 Federal Railroad Administration, DOT Pt. 236 RULES AND INSTRUCTIONS; ROADWAY 236.590 Pneumatic apparatus. 236.526 Roadway element not functioning Subpart F—Dragging Equipment and Slide properly. Detectors and Other Similar Protective 236.527 Roadway element insulation resist- Devices ance. 236.528 Restrictive condition resulting from STANDARDS open hand-operated switch; requirement. 236.601 Signals controlled by devices; loca- 236.529 Roadway element inductor; height tion. and distance from rail. 236.530 [Reserved] Subpart G—Definitions 236.531 Trip arm; height and distance from rail. 236.700 Definitions. 236.532 Strap iron inductor; use restricted. 236.701 Application, brake; full service. 236.702 Arm, semaphore. 236.533 [Reserved] 236.703 Aspect. 236.534 Entrance to equipped territory; re- 236.704 [Reserved] quirements. 236.705 Bar, locking. 236.706 Bed, locking. RULES AND INSTRUCTIONS; LOCOMOTIVES 236.707 Blade, semaphore. 236.551 Power supply voltage; requirement. 236.708 Block. 236.552 Insulation resistance; requirement. 236.709 Block, absolute. 236.553 Seal, where required. 236.710 Block, latch. 236.711 Bond, rail joint. 236.554 Rate of pressure reduction; equal- 236.712 Brake pipe. izing reservoir or brake pipe. 236.713 Bridge, movable. 236.555 Repaired or rewound receiver coil. 236.714 Cab. 236.556 Adjustment of relay. 236.715–236.716 [Reserved] 236.557 Receiver; location with respect to 236.717 Characteristics, operating. rail. 236.718 Chart, dog. 236.558–236.559 [Reserved] 236.719 Circuit, acknowledgment. 236.560 Contact element, mechanical trip 236.720 Circuit, common return. type; location with respect to rail. 236.721 Circuit, control. 236.561 [Reserved] 236.722 Circuit, cut-in. 236.723 Circuit, double wire; line. 236.562 Minimum rail current required. 236.724 Circuit, shunt fouling. 236.563 Delay time. 236.725 Circuit, switch shunting. 236.564 Acknowledging time. 236.726 Circuit, track. 236.565 Provision made for preventing oper- 236.727 Circuit, track; coded. ation of pneumatic break-applying appa- 236.728 Circuit, trap. ratus by double-heading cock; require- 236.729 Cock, double heading. ment. 236.730 Coil, receiver. 236.566 Locomotive of each train operating 236.731 Controller, circuit. in train stop, train control or cab signal 236.732 Controller, circuit; switch. territory; equipped. 236.733 Current, foreign. 236.567 Restrictions imposed when device 236.734 Current of traffic. 236.735 Current, leakage. fails and/or is cut out en route. 236.736 Cut-section. 236.568 Difference between speeds author- 236.737 Cut-section, relayed. ized by roadway signal and cab signal; 236.738 Detector, point. action required. 236.739 Device, acknowledging. 236.740 Device, reset. INSPECTION AND TESTS; ROADWAY 236.741 Distance, stopping.
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