Sig­nal as­pects

Model Rail (UK) - - Workbench -

Trains need long dis­tances to stop, so the driver needs as much warn­ing of when the next sig­nal is at dan­ger as pos­si­ble. This is done by dis­play­ing a yellow light on the sig­nal. For lines car­ry­ing very fast trains this is insufficient warn­ing, so the sig­nal in front of the one dis­play­ing the yellow light will dis­play two yellow lights (called dou­ble-yellow). This type of sig­nal is a four-as­pect sig­nal which dis­plays red, yellow, dou­ble-yellow and green. Semaphore sig­nalling uses two dif­fer­ent types of sig­nals. A dan­ger sig­nal with a red arm at which the driver must stop when the sig­nal arm is hor­i­zon­tal. A dis­tant sig­nal with a yellow arm is there purely as a warn­ing for when the next sig­nal is at dan­ger.

Left: Red LED lights il­lu­mi­nate when a train is de­tected. The pot (short for po­ten­tiome­ter, the small, ad­justable Philips screw­hole on the cir­cuit board) can be ad­justed with a screw­driver to al­ter the amount of time the se­quence takes to go from red to green.

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