People are using the far left of three escalators, which are enclosed inside an elongated tunnel.
People riding escalators
riding escalators is a rephrasing of using escalators.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(n_leave(x2) & a_far(s1) & Theme(s1,x2) & Theme(e2,x2) & Actor(e2,x1) & v_use(e2) & inside(e1,x5) & n_tunnel(x5) & a_elongated(s2) & Theme(s2,x5) & Theme(e1,x4) & v_enclose(e1) & (x2 = x4) & of(x2,x3) & n_escalator(x3) & card_eq_3(x3) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_escalator(x3) & (x1 = x2) & n_people(x1))