... area marked by the red box contains three crossing tracks at different levels. If I swop the Terminus line with the upper Main what is the advantage? I still have to maintain a differential height and the distance between the junction and the crossing point has not changed. So the climbing gradient will be the same as the previous falling gradient. In addition, the falling gradient will become a climbing gradient for traffic leaving the Terminus. Hi Brian, I meant something like this, replacing the burrowing junction with a flying junction: brian_tuckey1.png The long rising gradient up to the terminus runs from A to B. Departing trains on the falling gradient have a shorter steeper fall from C to D. The through routes are now straight, which I think is what you wanted originally. Unless I've missed something obvious? regards, Martin. posted: 17 Aug 2007 04:18 from: BTuckey Martin Wynne wrote: The long rising gradient up to the terminus runs from A to B. Departing trains on the falling gradient have a shorter steeper fall from C to ...