All it is is a trigger_camera in a black box, with the houndeye following a path or script, and a custom texture or two. The bar itself is, I imagine, a train or door. It's not actually loading anything, but it looks great :).
Actually, I remember, Kasperg released the .RMF and .MAP anyway. I removed the .RMF from the unofficial result page download (very large) but the .MAP's still there, so you can have a look.