Caption: When the Roberts Bank coal terminal was first constructed, railway infrastructure was just a single line on the north side of the causeway roadway, as seen on the right of this photo, with the unloading loop switch just before the single-car rotary dumper visible in the distance. With increased traffic, a track was added on the south side of the causeway roadway for emptied trains to await their next crew, which is what 4573 and 5596 and unseen remotes are doing on Friday 1974-07-05.

Note the caboose just clear of the dumper in the distance. The original loop track ran counter-clockwise, now completely rearranged to an offset clockwise loop with numerous storage tracks on the north side of the roadway, plus an immense intermodal facility this side of the loop track.

Check https://vancouversun.com/business/local-business/port-of-vancouvers-contentious-roberts-bank-terminal-2-proposal-6-things-to-know for an indication of accumulated growth in the last fifty years and plans for even more intermodal capacity. I am glad to have known it from when it was a youngster.