@gunrunnerjohn posted:"I did test before laying the track! There's no way I could live with 4" spacing, I have a bunch of articulated steam that would be taking out anything on the next track with that spacing. On our club layout we had two tracks with 4.5" spacing, the outer track was O90, the inner track was O81. My Vision Line Big Boy on the inside track sideswiped a 21" passenger train and took a bunch of cars off the rails."
The UP articulateds seem to have the most overhang of all, they take out signals, lineside structures, etc., so we banished them! 😉