OHW, Beacons & Points Flashcards
Components of the OHW
Catenary Wire
Catenary Span Wire
Contact Wire
Contact Span Wire
Contact Span Wire Mast Insulators
Hanger
Dropper
Insulated Dropper
Spreader Bar
ORCS
Overhead Rigid Conduction System
Beacons
Train Localisation Equipment in the 4ft along the network. They communicate with the train via the beacon antennas as trains pass.
Using a unique code, they provide precise localisation info to the Carborne Controller assisting with callibration of odometer and precise train stopping.
Types of Beacons
Callobration of odometers
ATO first approach - approaching a station or LOA
ATO second approach - entering a station or closely approaching a LOA
Localisation & Relocalisation
Axle Counters
Used as a SDD for rail traffic on the network
PPI
Point Position Indicators are fixed signals that provide information about the route for which the signal is cleared
SPAD
Signal Passed at Danger
Buffer Stop Signals
Buffers stop signals are positioned at the end of the rail/siding to indicate the end of the rail line
Points
A movable rail section that directs vehicles from one track to another.
Points have a stock rail (stationary rail) and a switch blade (moving rail)
Facing Point
Location where a diverging movement may be made in the normal direction of travel for the track concerned.
Trailing Point
Location where a converging movement may be made in the normal direction of travel for the track concerned.
Fouling Points
located near the convergence of two tracks indicating where trains may run safely on both tracks without contact
Catch Points Normal Position
When in the NORMAL position there will be a gap between the switch blade and stock rail. This prevents unauthorised trains entering the mainline from the EPP siding. PPI will be at STOP. If a route is set and no action is taken, catch points self normalise after a few seconds.
