Another ATSF Admirer

Helix, First Loop Clearance

Increasing the clearance of the first loop by about 2-3mm by reducing a 3-ply spiral to 2-ply. Note that this is actually still tighter than my NMRA gauge, but there is now enough clearance to run double-stacks.

Helix, First Loop Clearance
Another ATSF Admirer, Jun 2, 2008