One of the buses is marked "Linea Express" while the other is marked "Metropolitan Transit System". 
The two buses are marked with the same color lettering
Not all buses have the same color lettering.
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 e2 e1 s1 x1 x2 x3.(n_color(x2) & a_same(s1) & Theme(s1,x2) & n_bus(x1) & card_eq_2(x1) & with(e1,x2) & Actor(e2,x3) & v_letter(e2) & (x2 = x3) & Theme(e1,x1) & v_mark(e1))