[rxdazn]

Not going to defend Eurostar because I think their pricing is a joke but if you book some time in advance (I'd say at least 2 weeks beforehand), it would be between 140-180£ for a return trip. That's for a peak time trip, leaving London on a Friday at 6pm and coming back from Paris on a Sunday at 6pm.

The £29 one way tickets do go really quickly yes.

[jopsen]

With a train what is limiting the number of tickets. I mean adding another passenger cartridge can't be that expensive..

Is it security and border control that slows things down?

[matthewmacleod]

Yeah, you can’t just couple more carriages on to a train. The e320 trains are already sixteen cars; extending this means that platforms and signalling systems have to be modified to deal with longer trains, which can be phenomenally expensive. And more traction power needs to be available, which means you will required a motored car.

It’s more complex than sticking carriages together!