|Subject: Re: Italy travel question|
This is a bus service from Roma Tiburtina station to Siena: http://makeashorterlink.com/?U2FE11B5B
Sorry the site is partly in Italian but there are contact details for phone and e-mail. The cost is shown at 17.50 eur one way, but I'm not sure it has been updated since last year.
Bye Paolo Trieste,Italy