Checked the wiki first to see if I could find the answer to this question. Unfortunately I couldn't, so here I am.
Is there any way to get from Bangkok International Suvarnabhumi Airport to Ayutthaya by train without having to go into Bangkok proper? We are desperately trying to avoid spending too much time in traffic, as we only have a couple of days to see the sights in this area. I have heard there is a train from the old international airport, but I can't seem to find any information about routes from the new place.
Any words of wisdom will be, of course, highly appreciated! Thanks!
I flew out of Suvarnabhumi in May and did not see any train tracks. I did check on transport options and train service was not listed. It seems that they do plan and having train service, but it is not operational just yet. I hope some of our BKK members will give the definitive answer before you leave for your trip.
I've never been to Ayutthaya, so this isn't based on experience, but: Suvarnabhumi Airport lies in the southeast of Bangkok. There's a whole lot of city to the north of it that you'd have to cross. As Mike said, there's indeed no rail transport out of the airport yet (currently planned for late 2009, iirc; unless there's yet more delays, of course).
Your best bet is probably taking a metered taxi to Om Nut skytrain station (~30 minutes iirc, costing about 200 baht), then taking the skytrain to Asoke (~10-15 minutes, ~25 baht), transferring to the metro and riding that to its endpoint, Hualamphong station (~10-15 minutes, ~25 baht), and then training out from there.
Alternatively you can ride the skytrain from Om Nut all the way to Mo Chit (~30-40 minutes?, ~40 baht?), taking a metered taxi from there to the Northern bus terminal (~5-10 minutes, ~50 baht), and taking a bus to Ayutthaya. (I don't know what the train service to Ayutthaya is like, but in general in Thailand travelling between cities by bus is significantly swifter than travelling by train.)