Ahhh, another long awaited piece of art from the internet's favourite trip reporter! This report totally destroyed my productivity for a couple of days, but obviously it was absolutely worth it! Great stuff as always.
Having read every single Seat2A report over here (and the copies that were once posted on a.net too) multiple times over I can certainly recognize a lot of the recycled pictures and paragraphs - but at this scale that's easy to forgive. Over the years these reports have inspired me to do many things, including lots of roadtrips through the American West and a couple of Amtrak long distance trains (in sleepers of course!).
Interestingly I was trying to catch the Chiang Mai - Bangkok sleeper service this summer too, but booking tickets via the very same agency as you used seemed too much of a hassle to me so I gave up and flew TG instead on a dirt cheap fare (and on an A330!). Oh and I did fly PG up to Chiang Mai as well!
Keep up the good work, Elton! There sure is an appreciative readership around here.