Fixed Gear London's London to Brighton ride

Cool, were all the bikes allowed on one train?

i can't speak for this specific case, but southern trains are technically only allowed 4 bikes or something like that in the specific bike part. but i have rarely had problems taking more, it depends on the guard, e.g. on a couple of occaisions the guard has refused to let more bikes on/put the bikes in other spaces but this has usually been at peak times.