Code of Federal Regulations > Title 49 > Chapter II > Part 236 > Subpart G - Subpart G—Definitions

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

§ 236.700 - Definitions.

§ 236.701 - Application, brake; full service.

§ 236.702 - Arm, semaphore.

§ 236.703 - Aspect.

§ 236.704 - [Reserved]

§ 236.705 - Bar, locking.

§ 236.706 - Bed, locking.

§ 236.707 - Blade, semaphore.

§ 236.708 - Block.

§ 236.709 - Block, absolute.

§ 236.799 - Section, fouling.

§ 236.800 - Sheet, locking.

§ 236.801 - Shoe, latch.

§ 236.802 - Shunt.

§ 236.802a - Siding.

§ 236.803 - Signal, approach.

§ 236.804 - Signal, block.

§ 236.805 - Signal, cab.

§ 236.806 - Signal, home.

§ 236.807 - Signal, interlocking.

§ 236.710 - Block, latch.

§ 236.808 - Signals, opposing.

§ 236.809 - Signal, slotted mechanical.

§ 236.810 - Spectacle, semaphore arm.

§ 236.811 - Speed, medium.

§ 236.812 - Speed, restricted.

§ 236.813 - Speed, slow.

§ 236.813a - State, most restrictive.

§ 236.814 - Station, control.

§ 236.815 - Stop.

§ 236.816 - Superiority of trains.

§ 236.817 - Switch, electro-pneumatic.

§ 236.711 - Bond, rail joint.

§ 236.818 - Switch, facing point.

§ 236.819 - Switch, hand operated.

§ 236.820 - Switch, interlocked.

§ 236.820a - Switch, power-operated.

§ 236.821 - Switch, sectionalizing.

§ 236.822 - Switch, spring.

§ 236.823 - Switch, trailing point.

§ 236.824 - System, automatic block signal.

§ 236.825 - System, automatic train control.

§ 236.712 - Brake pipe.

§ 236.826 - System, automatic train stop.

§ 236.827 - System, block signal.

§ 236.828 - System, traffic control.

§ 236.829 - Terminal, initial.

§ 236.830 - Time, acknowledging.

§ 236.831 - Time, delay.

§ 236.831a - Track, main.

§ 236.832 - Train.

§ 236.833 - Train, opposing.

§ 236.834 - Trip.

§ 236.713 - Bridge, movable.

§ 236.835 - Trunking.

§ 236.836 - Trunnion.

§ 236.837 - Valve, electro-pneumatic.

§ 236.838 - Wire, shunt.

§ 236.714 - Cab.

§§ 236.715-236.716 - §[Reserved]

§ 236.717 - Characteristics, operating.

§ 236.718 - Chart, dog.

§ 236.719 - Circuit, acknowledgment.

§ 236.720 - Circuit, common return.

§ 236.721 - Circuit, control.

§ 236.722 - Circuit, cut-in.

§ 236.723 - Circuit, double wire; line.

§ 236.724 - Circuit, shunt fouling.

§ 236.725 - Circuit, switch shunting.

§ 236.726 - Circuit, track.

§ 236.727 - Circuit, track; coded.

§ 236.728 - Circuit, trap.

§ 236.729 - Cock, double heading.

§ 236.730 - Coil, receiver.

§ 236.731 - Controller, circuit.

§ 236.732 - Controller, circuit; switch.

§ 236.733 - Current, foreign.

§ 236.734 - Current of traffic.

§ 236.735 - Current, leakage.

§ 236.736 - Cut-section.

§ 236.737 - Cut-section, relayed.

§ 236.738 - Detector, point.

§ 236.739 - Device, acknowledging.

§ 236.740 - Device, reset.

§ 236.741 - Distance, stopping.

§ 236.742 - Dog, locking.

§ 236.744 - Element, roadway.

§ 236.745 - Face, locking.

§ 236.746 - Feature, restoring.

§ 236.747 - Forestall.

§ 236.748 - [Reserved]

§ 236.749 - Indication.

§ 236.750 - Interlocking, automatic.

§ 236.751 - Interlocking, manual.

§ 236.752 - Joint, rail, insulated.

§ 236.753 - Limits, interlocking.

§ 236.754 - Line, open wire.

§ 236.755 - Link, rocker.

§ 236.756 - Lock, bolt.

§ 236.757 - Lock, electric.

§ 236.758 - Lock, electric, forced drop.

§ 236.759 - Lock, facing point.

§ 236.760 - Locking, approach.

§ 236.761 - Locking, electric.

§ 236.762 - Locking, indication.

§ 236.763 - Locking, latch operated.

§ 236.764 - Locking, lever operated.

§ 236.765 - Locking, mechanical.

§ 236.766 - Locking, movable bridge.

§ 236.767 - Locking, route.

§ 236.768 - Locking, time.

§ 236.769 - Locking, traffic.

§ 236.770 - Locomotive.

§ 236.771 - Machine, control.

§ 236.772 - Machine, interlocking.

§ 236.773 - Movements, conflicting.

§ 236.774 - Movement, facing.

§ 236.775 - Movement, switch-and-lock.

§ 236.776 - Movement, trailing.

§ 236.777 - Operator, control.

§ 236.778 - Piece, driving.

§ 236.779 - Plate, top.

§ 236.780 - Plunger, facing point lock.

§ 236.781 - [Reserved]

§ 236.782 - Point, controlled.

§ 236.783 - Point, stop-indication.

§ 236.784 - Position, deenergized.

§ 236.785 - Position, false restrictive.

§ 236.786 - Principle, closed circuit.

§ 236.787 - Protection, cross.

§ 236.787a - Railroad.

§ 236.788 - Receiver.

§ 236.789 - Relay, timing.

§ 236.790 - Release, time.

§ 236.791 - Release, value.

§ 236.792 - Reservoir, equalizing.

§ 236.793 - Rod, lock.

§ 236.794 - Rod, up-and-down.

§ 236.795 - Route.

§ 236.796 - Routes, conflicting.

§ 236.797 - Route, interlocked.

§ 236.798 - Section, dead.