I have a pass for the ZVV network, but say I want to travel to outside the network to Baden

I'm not quite sure what I need to do - buy a separate return ticket from Otelfingen to Baden, or Würenlos to Baden? (I'm assuming that I'm not covered all the way to Baden, even though the suburban train S6 goes all the way out there)

http://www.zvv.ch/fahrplan_liniennetzplan.asp

Or is there another extension ticket for neighbouring networks (for day trips only)?

AFAIK you need to buy a regular SBB train ticket from the last stop covered by the ZVV network to your final destination. (E.g. if you take the S6 you'll need a ticket from Otelfingen to Baden but if you take the IR train which doesn't stop between Zurich HB and Baden, you'll need a ticket from Zurich HB to Baden.)

you need to find out how many zones you will pass through outside ZVV and then buy an "Anschlüssbillet" for that number of zones. I often do this with a daily card for Zurich - I need +6 zones for me to get to my stop and the inspectors love me for it

Thanks for the responses. Lob - from what I can see on the ZVV website, the "Anschlüssbillet" only applies to zones in the ZVV. Doesn't look like the Aargau network is divided into zones anyway.

http://www.ag.ch/verkehr/shared/doku...zgrosssolo.pdf

Funny that - because my stop is the first out of ZVV-world. Maybe I'm travelling illegally?

Is this for occasional or regular trips? I used to have a monthly pass from Baden to Zurich which included Zone 10 in ZH. There is also something called a Cityticket, although I think this is designed for those living outside Zuri and wanting to travel on the ZH bus and tram system.

I've just found a link, it's actually called a City-City Ticket

Just occasional trips. Was really just looking at ways to get to Koblenz Dorf, on the German border.

The quickest way to get there is by IR to Baden, then catch a train from there. But as Mark75 pointed out, I would need to pay the full price (CHF 17.40 with half fare card) from Zurich HB, as this is the last stop on the IR before Baden.

http://www.zvv.ch/fahrplan_liniennetzplan.asp

A train to Bülach, then changing to the S41 would only cost CHF 7.00 with half fare card, as I'd travel mostly through the ZVV area, only needing to pay for a ticket from Kaiserstuhl (last stop inside the ZVV). Takes 20 minutes longer though