This rough example of a spiral easement shows the key characteristic -- the gradually increasing radius from tangent (straight) to the desired...
N gauge trains on the Maitai Valley Railway
This support shows the stair-step effect produced as each subsequent loop rises a little farther out than the previous (lower) loop. In this way,...
1st official Kellar Branch Traffic, June, 2006. The two tracks at the lower left corner of the pic are from the BN Alley tracks in Peoria.
Typical viewing height. Haggerty Steel is served by the RI Beltline, visible in the middle of the picture in front of the trees. The P&PU and...
Peoria Helix behind Haggerty Steel. Rock Island tracks curve to the left behind Haggerty Steel and eventually go to Iowa Jct. P&PU, BN, and...
Aerial of Peoria Helix from above CNW's Adams Street Yard. BN and CNW tracks exit to helix at the right. P&PU tracks curve to the left and...
Looking into the bowl of the Peoria Helix. Tracks leave the helix on Loop 2, Loop 4 (just barely visible at right), and Loop 5 (not visible).4...
Subroadbed is 1/2" homasote only, instead of homasote plus 1/2" OSB (wafer board). Loop is only 1 inch wide instead of 1.5 inches wide...
Spiral Helix (a genuine spiral with constantly increasing radii from 16" at the bottom to 22.5" at the top) 4' x 5.5' oval
