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The Y1/Y3 sentinel was based on the road going lorry
Perfect for 1870s-and-later layotus
With the following contents
Measures 23
• Approx
TTSS2 Sensor Signal 2 Aspect Distant Class_Class 122 The Y1/Y3 sentinel was basedWith the use of the Sensor Signal developed by Train Tech you can easily add automatic signalling into your layout in seconds. The signals work by detecting a locomotive, or full train passing by it using a very small infrared sensor built in to the signal base. As soon as the locomotive has passed the sensor the signal changes to yellow and will stay yellow for about seven seconds to let the train clear the block. It then reverts back to green. If
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