No, not for what I am trying to articulate.
The Height of the Regular Snow Shed is over 22 feet High, 18 feet across (or 9 feet from center of track) and the sections are 8 feet long.
These additions are half the height of the regular snow shed and add 8 feet to the width (or a total of 16 feet) and are only present on the first 6 sections (or so). So the end up looking like a long rectangular box along each side of the shed. Definitely not round. The cross section shows what looks like a walkway three or four feet off the ground. That is why I am thinking Storage for emergency coal or maybe loco servicing?
kev