10-09-2010, 04:27 PM
(10-09-2010, 08:16 AM)Jerry1237 Wrote: There is an arguement that TPWS is a form of non-continuous ATP. However, it is not fail safe, i.e. it loses power, it will not trip the train.
Both the GWML and Chilterns use a form of non-continuous ATP but that system is fail safe and can be modified to improve the track-track reception frequency by adding additional loops etc.
Jerry
True but if a loop loses power then the proving will be lost and the signal in rear will go to red and therefore the TPWS should intervene there. I agree it is no failsafe, particularly on board and that it is a bit of a misnomer- however it is infinitely better than not having anything at all.
PJW