Ask about railway infrastructure, organisations and EU rail law in plain language — type it or speak it —
and this tool turns the question into a live SPARQL query across three ERA endpoints:
rinf-plus (infrastructure), OCR-KG (organisations) and era-lex
(EU rail legislation). It recognises a fixed set of question shapes by keyword matching, in English,
French, German, Spanish or Italian — not a general language model — so an unrecognised question gets a
nudge toward the sample questions below rather than a guess.