@Brandon ***********
It is correct that the train stops at the border and then continue on the other side of the border. But you have a train/bus ticket for the entire route and in that way it does not necessarily have to be a plane ticket.
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"Is there a direct bus between Bangkok and Cambodia?
Yes, there is a direct bus departing from Bangkok Mochit Bus Terminal and arriving at Phnom Penh. Services depart five times a day, and operate every day. The journey takes approximately 12h 30m."
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"Evidence of travel to Thailand (air ticket paid in full).
A minimum of two inbound and outbound tickets are required for multiple entries visa."
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be2