For routes, with lines between the cities.

Preferable an interactive one. But an image would be ok.

Edit:

Found one, but the routes are a little limited.

http://www.planetware.com/i/map/THA/air-and-rail-routes-map.jpg

How about a sleeper bus/train route map?

Edited January 22, 201511 yr by wondercul

Don't know about the bus, but here's one for train travel: http://www.seat61.com/Thailand.htm

There are no sleeperbuses (China/VN-style ) in TH, as not legal.

As for air: daft simple; IF an airport has a link, its to BKK (whatever of the 2), the nr of direct routes bypasing BKK is less as 10.

More or less this also applies to the better VIP/1st cl+ buses, though there are a few more direct links north-Isan.