Thanks Chris, very helpful - that Click and Rail thingie is great; 9 CHFs to get from Lausanne to Geneva! Coo... (I assume I could just get on the train at Morges, providing the train stops there..?)

Anyway, back to my visitors. I know you're the travel guru round here, so do you happen to know of any other system that I could use to get them a day ticket, which could be purchased either here or via the UK and posted to them? It's to be a Christmas gift, you see; they don't really want 'stuff' so I thought I'd give them a day out, with a ticket and pocket money to buy coffees and lunch.

I suppose I could go with them to the station, buy the tickets and go da da! Happy Christmas! And that's your train, bye. But that's unlikely to be possible with the kids and school hours; I was looking for a one-stop card that they could just use to hop about on trains and buses for one day, at their leisure. So does this not exist..?

Many thanks for your help.

kodokan