Yes well, the big challenge for snowmobiling in central New Hampshire is not enough natural snow, and more heavy thick strong snow that covers the smooth trails and the railroad trails is what makes it happen, best.
More snow makes for better grooming conditions and better snowmobiling, no question.
Am just suggesting your internet map would be more informative with a railroad symbol superimposed on top of the colored trail lines to inform the map user what's what for snowmobiling by indicating which trails are a co-exist within the railroad track. ......
Your map says not one word about the railroad tracks, as if they do not exist. Like, what's up with these railroad tracks ..... what are they doing here? Is this a snowmobile trail or a railroad track?
...............
Two wheels up front:
The inside width of the two steel railroad rails are 48.5". The outside width of the two snowmobile skis are about 44". Why not attach a 44" 2x4" piece of lumber to the two skis and attach two railroad style 'flange' wheels to this wooden axle and drive the snowmobile over the rails just like a half track vehicle when there's not enough natural snow cover on the tracks and railroad ties.
The railroad trail system is open to snowmobiles from January 6 to March 15 in the lakes region, so having 'two wheels up front' could make it go better when the snow is too little.