Trains crossing

From Julien Arlandis in fr.rec.jeux.enigmes

Two peasants, Albert and Sylvester, are working in their fields, the two fields being on each side of a railway.
That afternoon, just after two trains crossed, Albert crossed the railway and fought Sylvester.
Many times in the past, two trains happened to cross while the two peasants were working in their fields, and the two peasants never fought, up to that day... Why ?

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