The scene that is shown in the opening credits was done on a modified Dealer Display Layout, but as part of the "modification" they sent the elevated track up and over some lower tracks forcing them to cut a trestle in half and add an additional support that you can see coming in from the right. They were also unable to properly support the track joint directly before the half trestle, as it was directly over the lower track, which causes considerable sag when the Berkshire passes over. This is really noticeable after the locomotive passes and the track springs back up.
Does anyone remember from previous discussions which dealer display layout they modified?