Generally the so-called development of relations is not development at all, it is passing to the next stage which is really subsequent, but not more advanced (unlike those who drive relations forward would like to think of it). But the tram, even a black tram of the bright future, coming to its next stop does not develop - it just happens to be one bit closer to the end of the route, to the ring where it will start again from after the motoman has had some rest and has filled all the papers required.