Author of:

• https://signal.eu.org/osm/ railway routing from OSM data
• https://signal.eu.org/osm/bugs/ identify and map possible bugs in OSM railway data
• https://signal.eu.org/rail/ commercial passenger train timetables and routes, possibly with realtime updates
• … try the railway spotting function near a railway line: https://signal.eu.org/rail/spot/
• https://github.com/pbeyssac/millipede-caster an open-source RTK caster for centimetric GNSS positioning using centipede.fr