Hi, I'm in the planning stages for a Christmas layout. In order to save space, I need to have a loop of track under an elevated straight section (see picture). FYI, the center semi-circle is 0-60 Fastrack. I do not have measurements handy for any other aspects of the diagram. I was considering a bridge for the elevated section. I would not be able to have any piers, supports, or framework below track level. I'm interested in off-the-shelf MTH or Lionel bridges. What are the longest single track bridges on the market now? Are there any retired or discontinued models to consider? How long can they be without any piers in the middle?
Thanks