premise: A man doing maintenance on the railroad tracks
hypothesis: There is a man working on the railroad tracks.
explanation_1: A man is working by doing maintenance on the railroad tracks.
explanation_2: "There is a man working on the railroad tracks" is a rephrasing of "A man doing maintenance on the railroad tracks."
explanation_3: A man doing maintenance implies he is working.
premise_logic: exists e1 x1 x2 x3 x4 x5.(n_track(x4) & of(x4,x5) & n_railroad(x5) & a_topic(x1) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_maintenance(x3) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists p1 x1 x4 x5.(n_track(x4) & of(x4,x5) & n_railroad(x5) & exists e1 x2 x3.((x1 = x2) & on(e1,x4) & Actor(e1,x3) & v_work(e1) & (x2 = x3) & n_man(x2)))