Many people look over a railing to see what is below them in a busy area.
Several people look over a bridge railing at the crowd below.
Just because they are looking over the railing doesn't mean it is a bridge and doesn't mean they are looking at a crowd
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & exists e2 p2 s1 x4 x5.(n_thing(x4) & Theme(e2,x4) & Actor(e2,x1) & v_see(e2) & in(p2,x5) & n_area(x5) & a_busy(s1) & Theme(s1,x5) & below(x4,x1)) & n_thing(x1) & over(e1,x3) & n_railing(x3) & Actor(e1,x2) & v_look(e1) & n_people(x2) & n_quantity(x2) & n_people(x1) & n_quantity(x1))
exists e2 e1 s1 x1 x2 x3 x4.(n_crowd(x4) & over(e1,x2) & at(e2,x4) & r_below(x4) & Actor(e2,x3) & v_rail(e2) & (x2 = x3) & n_bridge(x2) & Actor(e1,x1) & v_look(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))