The passengers on the Avanti West Coast train appear to have got into a row about their feet touching each other under a table on the 11.13am train from London Euston to Manchester Piccadilly.
The runner from Worthing, West Sussex, finished a 16,000km journey from South Africa to Tunisia in April last year. His latest challenge will see him run 3,000km, but with 30,000ft of elevation gain - the equivalent of 10 Mount Everests.