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Most buffer stop loops are set at 12.5 mph. 10 mph was originally the standard set speed for buffer stop loops, but this was increased to 12.5 mph after a few years.

Gresty Lane SCC is located in the same building as Crewe SB, but is treated as a separate signalling control centre.

Baker's Rail Atlas shows two 75 cm-gauge peat railways near Ballymena.

But was it plated as semi-automatic ("semi" above a black horizontal band)?

A replacement facility in the signal box does not by itself turn an automatic signal into a semi-automatic signal. A semi-automatic signal was one controlled from a location that could open or close (usually a ground frame), and was plated as semi-automatic so that drivers knew to treat it as an...

I think the origin intention when TPWS was being developed was that AWS would be subsumed into it from an operational perspective, and the AWS name would then be discontinued.

Platform 11A was occasionally used by passenger trains at times of service disruption. It was fully signalled to passenger standards, but not normally used because of its location far from the station concourse.

When the East Coast Main Line was being electrified up to Edinburgh, a theft alarm system using mercury switches was attached to the unenergised catenary, which gave an alarm at the BT Police HQ at Cowcaddens when activated.

The freight-only line from Lugton to Giffen is completely closed now, not just out of use.

Why isn't Ormskirk depicted in the same manner?

Excellent! Thanks for the update. I found a typo: Glengarnock is shown as "Glengarnoch".

See also [18.63] on page 4.

At least that name makes sense (even if it's not what the Rule Book calls them). "Stop car marker" makes no sense.

How many have you seen with "stop car" written on them, versus the countless thousands of them that say "car stop"? The industry-agreed Rail Industry Standards call them car stop markers.

Car Stop Marker (CSM) is the correct term.

That's currently on my bookshelf, next in line to be read. I knew the author long ago when we were children/teenagers.

Coloured plates on signal posts sounds like a bad combination.

Arguably it was the introduction of double decker buses that created the problem, and therefore the onus should be on the companies that operate them to re-assess the risks.

HU709 will remain red until the train has got past HU717. The distant signals HU717R and HU721R aren't shown on the diagrams posted above.

Do the other platforms have car stop markers for 5-car trains? Do 5-car trains regularly call at the station? Car stop markers are usually only installed to cater for expected train formations, and not for every possible train length in 1-car increments, so a platform might have markers for 2...