Bendtrack
BendTrack was created in 1986 and uses "balloon modules" to turn the double track mainline around to the opposite side of the module. BendTrack modules are 50” height, and can be of any length.
From the BendTrack manual:
The BendTrack modular system is based on standard modules of varying lengths that are two feet in width at their abutting surfaces. N scale was selected as the size most appropriate for the amount of space that would be available on the module surface.The entire concept is based on a two sided module with a double-track mainline on each side. This 'feels' more prototypical than the N-trak triple-track mainline, and leaves more space for scenery.
Within the standard, there is an optional center divider which can serve as a scenery backdrop for both sides. When a center divider is installed, it is like having two traditional modules assembled back to back with no space between the two. Many groups have opted to not use the center divider, choosing instead for a more 'natural' methods to block the view ... buildings, trees, hills,and so forth.
