Originally Posted by
Sirhalberd
The train in question leaves Hua Lam Pong (for Aranya Phrathet) at 5:55AM. How will your scenario work for the OP? Also, there are at least 2 'official' transit points from the airport train to the SRT at Hua Mak and Makkasan (not to mention the possibility of Lat Krabang) rendering the need to get all the way to Hua Lam Pong unnecessary.
OP mentioned they already did the Moh Chit run previously and would prefer to avoid heading into town only to pass the airport on the way to Cambodia.