One of the buses is marked "Linea Express" while the other is marked "Metropolitan Transit System". 
There are people at the bus stop
Not all bus stops have people.
exists e1 p1 x1 x2 x3 x4 x5 x6 x7 x8.(ne_org_system(x6) & (x6 = x8) & ne_org_transit(x8) & (x6 = x7) & ne_org_metropolitan(x7) & n_other(x5) & ne_geo_express(x3) & (x3 = x4) & ne_geo_linea(x4) & n_bus(x2) & exists e2.(Recipient(e2,x6) & Theme(e2,x5) & v_mark(e2)) & while(e1,p1) & Recipient(e1,x3) & Theme(e1,x1) & v_mark(e1) & of(x1,x2) & n_thing(x1) & card_eq_1(x1))
exists p1 x1 x2 x3.(n_stop(x2) & of(x2,x3) & n_bus(x3) & at(p1,x2) & exists x4.((x1 = x4) & n_people(x4)))