OK I give up what are we supposed to know you are talking about this time Are you telling me we can obtain two British rail trains for nothing - if so what would we do with them?
Its illegal to ride on a train without paying. A lot of people do it, me included once or twice. But it is illegal and you'll find yourself in court if you get caught.
Fare dodging but I reckon you were just lucky and the conductor didn't get on. I can't imagine there would be barriers in Alfreton station.