What did legit mean?
In Tahoe, there are lot of new trails, built by friends of mine, and I'm sure they are not first Forest service"approved".
Are they on the mountain project?
In my specific reference, 'legit' means the road exists on USGS (and other) maps but passes through private property and passage isn't permitted by some of the property owner owners. Part of the road has been incorporated into a legit trail, but only a portion in the middle as a means to connect upper Barney Ford with V3 and lower Barney Ford.
There have been lots of illegal trails in Summit County. Most were either closed down and / or incorporated into our trail network. USFS, Summit County, Breckenridge and the Fat Tire Society, along with others, have been very active in designing, building and maintaining trails so our system has developed from highly unorganized to very organized in the course of the 18 years I've been here.
A large number of the illegal trails were on USFS land and poorly designed. They were DH trails or XC trails with serious DH components. Rain and use would degrade them from super fun to barely rideable in the course of 2 or 3 years. Many had hidden entrances to add obfuscation and try to keep the trails 'private'.
A huge number of our trails are the remnants of old mining roads and ditches (aka incorrectly as flumes.) The roads could be unsustainable and many were rerouted onto new singletrack ala Sidedoor. Ditches make great trails as they follow contours and are basically ready made except for needing to remove trees that have grown up. A great example are Upper, Middle and Lower Flume trails (really ditches) that are rideable early in the season and deal well with water (mostly at least.)
The Town of Breckenridge is constantly upgrading, repairing and building trails. At least two new sections were built this year; the ones I referred to earlier: Hard Luck (a super fun intertwined flow trail with some big air possible) and the upper extension of Nightmare on Baldy (aka Harvester in my book;
New trail.)
BTW, The person I spoke with at MTB Project mentioned that they only want approved 'in-network' trails listed. If the local trail organization(s) didn't create and/or bless the trail, then it wasn't wanted in the Project. Legality, liability and all that coming into play.