Interlocking
The means by which the movement of signals and points are co-ordinated to prevent conflicting train movements occurring (ie collisions).
Intermediate Block-Section ...
Interlocking Tower - Often called signal or switch towers, these elevated railroad structures house mechanical or electrical signal and turnout control equipment.
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Interlocking. An arrangement of signals, switch lock, and signal appliances so interconnected that their movements succeed each other in a predetermined order. It may be operated manually or automatically.
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Interlocking Appliances
The parts of an interlocking that are capable of movement (i.e. switches, derails, locks, movable point frogs, movable bridges, etc.).
Interlocking Limits ...
Interlocking
A mechanical or electrical system of signaling which ensures that only one train at a time is allowed to move through a junction.
Intermodal ...
Interlocking
An arrangement of signals and switches connected, or "interlocked", in a way that their operations must succeed each other in a predetermined order, so that conflicting routes are impossible to set up.
Interlocking train detection circuits could be tied into Master Throw Button to automatically operate the turnouts or prevent them from throwing if they are blocked by a train or signal system.
Switch Machine Driver Notes ...
Interlocking Limits
The tracks between the extreme opposing home signals of an interlocking.
Interlocking Signals ...
An interlocking signal is a signal which governs an interlocking plant. An interlocking plant is the joining of two or more tracks.
An interlocking plant triggers signals automatically when an engine or train approaches.
Automatic Railroad Crossing (AKA Diamond) ...
The interlocking tower and tracks at Des Plaines, Illinois, in 1993.
A train of intermodal trailers on flat cars. Also see TOFC
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Definitions Points of Interest ...
PLANT"Interlocking system
PLUG""One-horse" passenger train. Also throttle of old-style locomotive; hence engineers were known as plug-pullers. Plugging her means using the reverse lever as a brake instead of the air.
NS visits York Interlocking to drop off a few cars. Sony P52 - Photo by Michael Lijewski.
This bridge skirts the left side of the last scene. Photo by Michael Lijewski.
Thus far, the former NCR Station looks to be spared. Photo by Michael Lijewski.
Interlocking An arrangement of signals and track switches and switches so interconnected that their functions shall succeed each other in proper sequence and for which interlocking rules are in effect.
Interlocking An arrangement of signal appliances so interconnected that their movements must succeed each other in proper sequence. It may be operated manually or automatically.
(1) LaserKit 478 interlocking tower
Long sidings are excellent for operating accessories or, in our example, a freight operation. This track plan is also good for commuter / trolley systems.
(14) Atlas 6043 O27 45° curve ...
Absolute Signal A block or interlocking signal designated by an "A" market or the absence of a number plate. Air Brake System All of the devices and parts included in making an air brake for controlling the speed and stopping a locomotive or train.
through the separation of trains by implementing a conflict free timetable, train detection and interlocking of routes. ATC allows the automatic control of trains throughout a railway network, obviating the need for train drivers.
Cab Signal A signal located in engineer's compartment or cab, indicating a condition affecting the movement of a train or engine and used in conjunction with interlocking signals and in conjunction with or in lieu of block signals.
A contrivance designed to prevent accumulation of snow and ice in tracks; sometimes a blowtorch held close to the snow, or a steam, electric, oil, or gas heater attached to the rails through the switch leads at interlockings or railroad crossings; ...
Early versions used complicated mechanical devices called interlocking machines with linkages and blocking gates. Later versions used electro-mechanical devices such as relays.
Annett's key (UK), Annett key (Aus.): A large key which locks levers or other items of signalling apparatus, serving as a portable form of interlocking. With the key removed from the lock, the lever or apparatus is locked in its position.
Controlled signals protect mainly dual control switches and are controlled by an interlocking and is under direct control by the dispatcher. A CTC interlocking location is often referred to as a Control Point (CP).
Catch-Handle Locking
A system of interlocking in a lever frame, where the mechanism is activated by raising the catch handle rather than moving the lever proper.
Interlocking - A system of electrical, and mechanical controls that allow only one train to move through a junction of two or more tracks at any one time.
The signalman would pull levers installed on this frame to operate semaphore signals. In North America these were called interlocking towers. For more details on signal boxes have a look at the Hampton Loade Signal Box page.
 See also: Track, Signal, Point, Train, Engine
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