the signal at Taplow has an infil grid mid section however it is only about 400 yards before so therfore when it has updated to a single yellow from a red a driver may only travel at that signals release speed which if memory serves me correct in this case is 25mph until his/her train passes over the grid. However if updating from a single yellow to a double yellow trains can aproach at 70mph or more with no
ATP▸ intrevention.
DB» LZB high speed signalling system has continuous arials so the train is always running at optimum speed and accelerates and decelerates according to the signal received and not just the aspect of the conventional signals. Thus it alows suitably equiped trains to run faster on exisitng lines which have both LZB and conventional signalling rather than just the high speed lines for which it was designed.
When European Railway Traffic Management System (ETRMS) is installed (which is currently being tested in Wales) on trains and at lineside in this country trains will run in a similar manner to that as mentioned above. Signalling will be in the cab instead of lineside. More and Faster trains would be able to run on our overcrowded railway system! Google ETRMS for more info!