I know that you are a knowledgeable lot out there and have probably seen/used this website in the past, but I've only recently stumbled across it. https://railsigns.uk/ as it says in the title, has details of numerous signs used on the rail network. As a warning there are the odd political messages about, but having ignored them, I have otherwise found it useful.
Posted by simonsmith3004 at 2024-01-04 10:54:53 UTC