A seven-year-old boy swims 21 miles to help other children.
Joseph Purcell decided to act after seeing television pictures from war-torn Syria.
So the youngster, who is from Wokingham, persuaded sponsors to back him as he tackled a distance equivalent to the English Channel.
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Drivers belonging to the RMT union are due to walkout at 9.30pm on Saturday in a dispute over a sacked colleague.
A new opinion poll gives the party an increased lead at the expense of the Greens.
The Rail Minister said it was not a matter of crowd control but passengers "trying to get home after a long day at work".