An American trail ends at a Depression-era boardinghouse in Duluth, Minn., where a cross-section of desperate Midwesterners washes up. Foreclosure, bankruptcy, impoverishment and a god of false hopes are all beating down the door. Yet in 'Girl From the North Country,' the spiritually rousing musical that marked its official Broadway opening Thursday at the Belasco Theatre, these '30s horsemen of the apocalypse never get us down. Enveloped in the moving lyricism of Bob Dylan's songbook, the show is akin to a poem of uplift - an ode to fellowship forged in adversity. A roomful of gorgeous melodies performed on a landscape of diminishing returns.