Collection is a little more complicated, as an “up” engine (bound for Sydney), would have to stop West of the siding, lock off its train, then proceed into the siding and draw the trucks up until the front truck was clear of the up points. Then, lock off the trucks, uncouple, back onto the mainline, change points, forward to past the Up points, change points, back into the siding and couple to the trucks, then draw them out of the siding onto the main line, stop change points, then back up to couple to the rest of the train, then proceed up to Sydney. (Even though “up” is downhill that’s railway talk)