- Section 236.700 - Definitions
- Section 236.701 - Application, brake; full service
- Section 236.702 - Arm, semaphore
- Section 236.703 - Aspect
- Section 236.704 - Reserved
- Section 236.705 - Bar, locking
- Section 236.706 - Bed, locking
- Section 236.707 - Blade, semaphore
- Section 236.708 - Block
- Section 236.709 - Block, absolute
- Section 236.710 - Block, latch
- Section 236.711 - Bond, rail joint
- Section 236.712 - Brake pipe
- Section 236.713 - Bridge, movable
- Section 236.714 - Cab
- Section 236.715-236.716 - Reserved
- Section 236.717 - Characteristics, operating
- Section 236.718 - Chart, dog
- Section 236.719 - Circuit, acknowledgment
- Section 236.720 - Circuit, common return
- Section 236.721 - Circuit, control
- Section 236.722 - Circuit, cut-in
- Section 236.723 - Circuit, double wire; line
- Section 236.724 - Circuit, shunt fouling
- Section 236.725 - Circuit, switch shunting
- Section 236.726 - Circuit, track
- Section 236.727 - Circuit, track; coded
- Section 236.728 - Circuit, trap
- Section 236.729 - Cock, double heading
- Section 236.730 - Coil, receiver
- Section 236.731 - Controller, circuit
- Section 236.732 - Controller, circuit; switch
- Section 236.733 - Current, foreign
- Section 236.734 - Current of traffic
- Section 236.735 - Current, leakage
- Section 236.736 - Cut-section
- Section 236.737 - Cut-section, relayed
- Section 236.738 - Detector, point
- Section 236.739 - Device, acknowledging
- Section 236.740 - Device, reset
- Section 236.741 - Distance, stopping
- Section 236.742 - Dog, locking
- Section 236.743 - Dog, swing
- Section 236.744 - Element, roadway
- Section 236.745 - Face, locking
- Section 236.746 - Feature, restoring
- Section 236.747 - Forestall
- Section 236.748 - Reserved
- Section 236.749 - Indication
- Section 236.750 - Interlocking, automatic
- Section 236.751 - Interlocking, manual
- Section 236.752 - Joint, rail, insulated
- Section 236.753 - Limits, interlocking
- Section 236.754 - Line, open wire
- Section 236.755 - Link, rocker
- Section 236.756 - Lock, bolt
- Section 236.757 - Lock, electric
- Section 236.758 - Lock, electric, forced drop
- Section 236.759 - Lock, facing point
- Section 236.760 - Locking, approach
- Section 236.761 - Locking, electric
- Section 236.762 - Locking, indication
- Section 236.763 - Locking, latch operated
- Section 236.764 - Locking, lever operated
- Section 236.765 - Locking, mechanical
- Section 236.766 - Locking, movable bridge
- Section 236.767 - Locking, route
- Section 236.768 - Locking, time
- Section 236.769 - Locking, traffic
- Section 236.770 - Locomotive
- Section 236.771 - Machine, control
- Section 236.772 - Machine, interlocking
- Section 236.773 - Movements, conflicting
- Section 236.774 - Movement, facing
- Section 236.775 - Movement, switch-and-lock
- Section 236.776 - Movement, trailing
- Section 236.777 - Operator, control
- Section 236.778 - Piece, driving
- Section 236.779 - Plate, top
- Section 236.780 - Plunger, facing point lock
- Section 236.781 - Reserved
- Section 236.782 - Point, controlled
- Section 236.783 - Point, stop-indication
- Section 236.784 - Position, deenergized
- Section 236.785 - Position, false restrictive
- Section 236.786 - Principle, closed circuit
- Section 236.787 - Protection, cross
- Section 236.787a - Railroad
- Section 236.788 - Receiver
- Section 236.789 - Relay, timing
- Section 236.790 - Release, time
- Section 236.791 - Release, value
- Section 236.792 - Reservoir, equalizing
- Section 236.793 - Rod, lock
- Section 236.794 - Rod, up-and-down
- Section 236.795 - Route
- Section 236.796 - Routes, conflicting
- Section 236.797 - Route, interlocked
- Section 236.798 - Section, dead
- Section 236.799 - Section, fouling
- Section 236.800 - Sheet, locking
- Section 236.801 - Shoe, latch
- Section 236.802 - Shunt
- Section 236.802a - Siding
- Section 236.803 - Signal, approach
- Section 236.804 - Signal, block
- Section 236.805 - Signal, cab
- Section 236.806 - Signal, home
- Section 236.807 - Signal, interlocking
- Section 236.808 - Signals, opposing
- Section 236.809 - Signal, slotted mechanical
- Section 236.810 - Spectacle, semaphore arm
- Section 236.811 - Speed, medium
- Section 236.812 - Speed, restricted
- Section 236.813 - Speed, slow
- Section 236.813a - State, most restrictive
- Section 236.814 - Station, control
- Section 236.815 - Stop
- Section 236.816 - Superiority of trains
- Section 236.817 - Switch, electro-pneumatic
- Section 236.818 - Switch, facing point
- Section 236.819 - Switch, hand operated
- Section 236.820 - Switch, interlocked
- Section 236.820a - Switch, power-operated
- Section 236.821 - Switch, sectionalizing
- Section 236.822 - Switch, spring
- Section 236.823 - Switch, trailing point
- Section 236.824 - System, automatic block signal
- Section 236.825 - System, automatic train control
- Section 236.826 - System, automatic train stop
- Section 236.827 - System, block signal
- Section 236.828 - System, traffic control
- Section 236.829 - Terminal, initial
- Section 236.830 - Time, acknowledging
- Section 236.831 - Time, delay
- Section 236.831a - Track, main
- Section 236.832 - Train
- Section 236.833 - Train, opposing
- Section 236.834 - Trip
- Section 236.835 - Trunking
- Section 236.836 - Trunnion
- Section 236.837 - Valve, electro-pneumatic
- Section 236.838 - Wire, shunt