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Lasting at least 21 days and covering 11,654 miles, it is the ultimate challenge for train buffs.
Experts believe a new record has just been set for the longest possible continuous railway journey.
Thanks to the opening of a railway in Laos earlier this month, it is now possible to travel from Lagos, in southern Portugal, all the way to Singapore by train with just a few changes.
The 11,654-mile journey could be done in 21 days allowing for overnight stays to make connections and sort out visas and other paperwork, say experts.
It tops the previous longest possible rail trip by around 1,000 miles and has been made possible by the opening on December 2 of a railway connecting the Laotian cities of Vientiane, the capital, with Boten, near the Chinese border.
The journey, which does require some very short interchanges between stations, has been calculated by users of the Reddit website with help from British train enthusiast Mark Smith.
