This massive helix is actually a pair of helices, one outside the other. At bottom right, the double track mainline enters the helix from east Sudbury and traverses a double-track helix to the top of the scene. At the top of the helix the interlocking junction at Romford will be fully modelled. Note the switch and switch machine; this is a temporary arrangement. The actual finished scene will have the double track main continuing to the left towards Montreal. The diverging single track line is the Parry Sound subdivision. While a train heading for Montreal will eventually be able to continue on the layout for quite some time yet before reaching the North Bay staging yard (which will be a full floor above this location on the layout), a train heading for Toronto will crest the helix at Romford, pass through the junction and promptly head down another helix which wraps around the outside of the first, dropping all the way to the bottom, where it reaches a two-level, twelve track staging yard (at bottom left) representing Toronto and southern Ontario.

The tracks just above the entrace to the helix from Sudbury, which the two trains are located on, is actually a hidden portion of the mainline west of Sudbury. This track wraps around the Romford helix in order to raise and turn the mainline so that it continues on a new shelf near where it disappears into the backdrop west of Sudbury. The track plan of the layout may seem complicated on paper, but it is actually designed for maximum ease of use while operating. Whenever a train leaves the modelled layout into hidden track, it always reappears just a few feet away from where it vanished.