The World’s Longest Train Journey Is Epic — but Nobody’s Ever Taken It
World's longest train journey, from Portugal to Singapore, is theoretical, crossing 13 countries and 8 time zones (11,654 miles). Although possible due to the 2021 Laos-China Railway completion, no one has completed it due to logistical challenges, practical issues, and the need for multiple train changes. Connections through Russia are currently disrupted by sanctions, complicating travel further. Critics argue that a single continuous journey doesn't truly exist since each leg requires separate tickets and arrangements.
https://bigthink.com/strange-maps/portugal-to-singapore-train/