With the warm weather here, Granite Staters are out on the rail-trails. Years ago, railroads criss-crossed New Hampshire. Now, some of those old rail corridors are making way for bikers and walkers, as well as equestrians and inline skaters, and, in winter, cross-country skiers. We discover the etiquette for the popular multi-use trails, and hear about connecting communities from Salem to Lebanon and beyond into the White Mountains.