New answers tagged united-kingdom
You originally tagged MapInfo and ArcGIS neither of which are open source, so I'm thinking it must be ordnance survey and their data products. "OS stack" is something unrelated and is open source software stack. So maybe data in a OS DB such as PostgreSQL/PostGIS displayed via a WMS Using geoserver, cached via geowebcache, and displayed to the end user ...
OS probably refers to Open Source software Stack refers to a set of software.
A search on data.gov.uk for rail returns several datasets that you might find useful. For example Network Rail - railway network Inspire data There's a WFS and a WMS for the rail network and for stations Here's a preview
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