Peco SL-46 TPWS Train Protection Warning System OSS Over Speed System Pk12 OO

Code: SL-46
RRP: £2.70 Our Price: £2.40
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Peco SL-46 TPWS Train Protection Warning System OSS Over Speed System Pk12 OO

Little Information About TPWS / OSS \/ \/ \/

In a standard installation there are two pairs of loops, colloquially referred to as "grids" or "toast racks". Both pairs consist of an 'arming' and a 'trigger' loop. If the signal is at danger the loops will be energised. If the signal is clear, the loops will de-energise.

The first pair, the Over Speed Sensor (OSS), is sited at a position determined by line speed and gradient. The loops are separated by a distance that should not be traversed within less than a pre-determined period of time (approximately 1 second for passenger trains) if the train is running at a safe speed approaching the signal at danger. Due to different braking characteristics freight engines operate at 120% of the passenger timing.

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