Construction workers work on railroad tracks at night.
There are construction workers.
Railroad tracks are constructed by construction workers.
exists e1 x1 x2 x3 x4 x5.(at(e1,x5) & n_night(x5) & on(e1,x3) & n_track(x3) & of(x3,x4) & n_railroad(x4) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists p1 x1 x2 x3.((x1 = x2) & n_worker(x2) & of(x2,x3) & n_construction(x3))