This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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RailMapOnline
railmaponline.bsky.social
did:plc:sb4uxn7cidusxsxh43bf5nhd
RailMapOnline.com contains interactive maps showing past and present UK, Irish and US railways. Now with historic canals, trams, trolleybus and military airfields too.