'Supplementary arrow signs' are the arrows that can be seen just beneath some signals or signage such as speed limits...
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What is a ground frame?
A ground frame is a bank of point levers placed at the trackside to operate nearby points or emergency crossovers and are generally found in remote locations too far away from a signal box to be connected by traditional rodding or wires.
The levers on a ground frame look very similar to those found in a signal box and operate in the same way but rarely have a building enclosing them. They are operated either by the train driver or a remote crew that is sent out in a van as and when their operation is required.
Because the points at a ground frame are not under the direct control of a signal box, a token or key is required to operate them, this can be in the form of a physical key or in more recent years an electronic token.
Ground frames are still used in many locations on the network where it's not deemed commercially viable to bring them under the control of a signal box or control centre, but many have also been removed especially ones that control emergency crossovers, this is much to the disgruntlement of engineers train operators who frequently face lengthy manoeuvres to access a parallel line.
Posted in: Model Railway
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