Originally Posted by
Tad's Broiled Steaks
When the train doors open at the Lo Wu (Luo Hu) terminus, you would join the the masses (from the train) as they race through the MRT exit gate, which leads right into Hong Kong passport control exit formalities. From there it's a no u-turn kinda deal directly on an indoor pedestrian bridge leading to Chinese passport control (no forgetting that duty-free now...). I "guess" you could stay on the train but one of the cleaners might kick you off, or worse.
I don't think that's the question being asked. I think the real question is "After going through Hong Kong exit passport control, is it possible to get back to inbound Hong Kong passport control without also clearing PRC passport control in both directions?" That is, could you exit Hong Kong, walk over the bridge that straddles the border, take a brief look around the inbound Immigration hall on the PRC side, then turn around and get back into Hong Kong?
If that is possible, it could make an interesting side trip for a visitor to Hong Kong. I think it's striking how different the vibe is as soon as you cross over the line.