Quote:
Originally Posted by hairyhandedfool
TPWS is an add-on to AWS, it replaces AWS in that it incorporates it.
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Exactly. A statement that TPWS is a direct replacement for AWS is misleading and wrong.
In the cab we still have the AWS cancelling button and the AWS sunflower. On the track we still have AWS magnets. If TPWS truly replaced the AWS hardware, it would be called TPWS.
We all know it's a lash-up, designed to be a poor man's version of ATP. The proof of this is that when the going gets tough and you neeed a safety system the most, ie: Degraded Working, TPWS has to be switched out because it isn't designed to handle complex situations.
I've lost count of the number of times recently when performing Single Line Working and Temporary Block Working where the TPWS is overridden. And yet the AWS continues to do the job it was designed for.
Hence my comments about AWS not being replaced.
(I've got a feeling that this one could run and run
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