I was running the freight services to Newhaven today on ECW. When I arrived at the yard and wanted to uncouple the wagons from the loco, I run into an invisible wall. I have to step onto the track of the through line in order to get around this wall. When coupling back the loco to the wagons to run back towards Lewes, I can into the same issues, but I believe it is a different position. But in short, in the Newhaven yard are some invisible walls that shouldn't be there.