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The signals are moving forward, not back.

The Cambrian line uses metric speeds (but imperial distances).

Maximum 45 mph (lower in some places).

That's right.

The gantry is being renewed primarily because of its condition, but it's being moved to a new position 96 metres further west for better signal spacing.

There weren't.

Those points were converted to power operation as part of the recent signalling upgrade.

Yes. Read the Independent Transport Commission's report "Wider Factors affecting the long-term growth in Rail Travel" (November 2018). Link to the report: https://www.theitc.org.uk/wp-content/uploads/2017/05/ITC-Report-Rail-Passenger-Demand-November-2018.pdf

The obstacle detector only checks that the crossing is clear when the exit barriers are being lowered, not continuously.

That would be the Enhancements Delivery Plan for Scotland. There was one published in 2022.

Since every train on the Liverpool Loop is an EMU with good braking characteristics and the service is intensive, the line was signalled to metro standards as used on the London Underground. Yellow/green repeaters are only provided where a stop signal has insufficient sighting distance for...

No, they aren't all platform starters. The North Eastern Railway had a significant installation of automatic semaphore signals (each with stop and distant arms) between Alne and Thirsk, but their arms stood normally in the horizontal position, only clearing when the appropriate track circuit on...

Rail replacement helicopter in Switzerland.

The North Eastern Railway had several co-acting signals where the lower arm worked in the upper quadrant to avoid fouling the structure gauge when 'off'; these were installed before the general introduction of upper quadrant arms on Britain's railways.

It seems like quite a few of the stations listed are in TCB territory, even though the controlling signal box may work AB to the next box.

No, it's not unique but not very common either.

It appears to be the same style, yes. It still exists, but is being replaced by a VDU workstation.

Time interval working was used on some single lines, in conjunction with train staff and ticket. The train staff ensured that trains couldn't enter the single line from opposite ends at the same time, but there also had to be a means of separating trains that passed consecutively through the...

It's perfectly possible with Electric Token Block or RETB providing the signalling is designed for it. The AB system is generally associated only with double lines.

Yes, at the end of 2011. I recently saw a box full of tiles from Paisley's NX panel at Bo'ness.