The entire British rail network ground to a halt today after it was discovered many routes were running with the wrong type of passenger.
"It seems to be an inherently British problem," admitted a spokesperson for RailTrack.
"Not only do the passengers expect the trains to be on time but when stopping at stations they can take anything up to 4 seconds to exit the train, wasting valuable time."
Many passengers, according to the report jointly produced by all the British rail companies, are also large and insist on bringing luggage, all of which brings the weight of the train up and causes delays.
"We've had reports of passengers bringing anything up to two suitcases," said the spokesperson.
"It ruins the carefully engineered drag coefficient..."
When challenged that they appeared to be reading words off a card and that things stored internally had no effect on aerodynamics the reply was unequivocal.
"Drag coefficient, drag coefficient, DRAG COEFFICIENT!"
The spokesperson then informed us it was "all your fault you public transport taking miscreants, you just don't understand science" and retired into the building.
Virgin Trains have already beaten the problem by creating the "Ultimate Virgin Train", which travels from Glasgow to Penzance but doesn't allow itself to be tainted by passengers.
"I think the Ultimate Virgin Train is a screaming success," said Virgin in a prepared statement.
"In it's first run it shaved whole minutes from the set time when we were inconvenienced by passengers.
"This is the future!"