Signaling and Train control
TYPES OF PRODUCTS
Signal Post
A railway signal is a visual display device that conveys or warns of instructions concerning the driver's authority to proceed. The driver interprets the signal's indication and takes appropriate action. A signal may typically inform the driver of the safe speed at which the train may proceed or instruct the driver to stop.
Shunt signal
Shunting is an umbrella term for a variety of locomotive, coach, and waggon movements. Shunting or shunt moves include changing the locomotive of a train, attaching/detaching coaches or waggons, and changing the order in which coaches or waggons are arranged in a train.
Shunting movements can be distinguished from other types of movements. The main distinction is that almost all shunting takes place within a single station or yard.
A mainline or regular train movement occurs when a vehicle or train leaves the confines of a station or yard.
Relay track
relay racks which were loaded with multi-contact relays. Before solid state logic, one could implement logic solutions by interconnecting the contacts and coils. Early railway interlockings were implemented in this way.
Location box
They are known as Location Boxes (or Junction Boxes) and contain wiring for various signaling system / circuitry functions! Actually, they are real-time GPS for railways that provide precise position to route relays for handling or functioning of tracks such as stopping, speeding, diverting, and so on.
Even if there are no nearby signals, the OFC/Signaling cables run alongside the tracks the entire length of the line. These cables are now interconnected via these junction boxes, and if a fault occurs, the S & T engineer can correct it by checking the relevant box.
Loop box
Loop boxes are primarily used to test physical signals entering and exiting an electronic rack or sensors terminated on sealed connectors. The wire points cannot be accessed for measurements for troubleshooting purposes without the loop boxes.
Point machine
A point machine is a device that remotely moves and locks turnout points under the control of an interlocking system. Point machines can be mechanical or electric, and in some cases hydraulic or pneumatic.
An electric point machine has the advantage over a mechanical in that it can be located further away from the interlocking machine because mechanical rods can only be so long before becoming too heavy to move by muscle force.
The electric machine is made up of two parts that are electrically separate but housed in the same housing. One component is the points lock, which uses an electromagnet to unlock the lock. Unenergized, the points are locked in either the straight or thrown direction. The other component is the motor.
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