Workers in hard hats at a railroad tracks construction site.
Two workers are riding a tandem bicycle.
A bicycle is not railroad tracks.
exists e1 s1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_track(e1) & n_site(x4) & of(x4,x5) & n_construction(x5) & in(x1,x2) & at(x2,x3) & n_railroad(x3) & n_hat(x2) & a_hard(s1) & Theme(s1,x2) & n_worker(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & of(x2,x3) & n_tandem(x3) & n_worker(x1) & card_eq_2(x1))