By Le Anne Lindsay, Editor Harriet Tubman, the most famous conductor on the Underground Railroad as a superhero. Not in a Marvel sense of course, however an intention to show a woman of extraordinary courage & heroism is behind director Kasi Lemmons and Gregory Allen Howard’s script – as we see Tubman jump off a bridge to elude captors, travel hundreds of miles alone on foot to free herself, then risking that freedom to return again and again to free others, brandishing pistols, wading through deep waters and basically exhibiting the kind of physical & mental strength usually reserved for male super or action heroes. We begin on a plantation,…