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TPWS is a much cheaper alternative to the more sophisticated Automatic Train Protection system which was recommended after the 1988 Clapham rail crash, in which 35 people died.
"TPWS is not effective for speeds over 70mph and less effective where the (safe) overlap between signals is less than 200 yards.
Chris Leah, head of safety at Railtrack, said fitting of TPWS had been 'a far more complex task' than was first envisaged and so far only 1,200 signals out of 11,000 had been fitted.
If a train with TPWS approaches a red signal too quickly, a sensor in the track will cut off the power and apply the brakes.
He said the industry could fit TPWS by 2003 while ATP would take at least 10 years to provide the same level of safety.
The train protection warning system - TPWS - offers less constant supervision, but does apply brakes automatically if a driver is going too fast.TPWS will cost around pounds 160million and but it is said to be only 70 per cent as effective as ATP.
Anti-collision device (ACD) and Train Protection Warning System (TPWS) are two such devices.
"It is a superb achievement to have completed the TPWS installation well in advance of the national deadline set by the Strategic Rail Authority.
The companies are now in discussion with the HSE's Railway Inspectorate about fitting the Train Protection and Warning System (TPWS), which prevents trains going through danger signals and thus reduces the chances of collisions.
I refer specifically to comments made by Roger Henderson QC in respect of the Ladbroke Grove and Southall rail disasters (Post, Oct 28), concerning the failure to install the ETCS system which is safer than the Train Protection Warning Systems (TPWS) that are currently in use.
A report from top engineer Sir David Davies earlier this year said the Train Protection Warning System (TPWS) could be introduced more quickly than the sophisticated and costlier Automatic Train Protec-tion (ATP) system which Paddington survivors favour.
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