The Walnut lane bridge was certainly most of my wanting to reproduce something similar in HO scale. Although the Walnut lane bridge is a roadway bridge with cantilevered sidewalks, the main structural elements for a railroad bridge would be similar, and I did not try to reproduce an exact copy this bridge, which is right in my neighborhood.
Walnut Lane bridge from creek walking path
The bridge was built in 1908 and at that time was the longest masonry arch span in the world, just now finishing a restoration.
All the switches are either Micro Engineering (and Dcc ready) or Shinohara altered to be DCC friendly. Also wires soldered to frogs and fished down through holes to connect to tortoise contacts below the layout
Back after a summer of visiting various railroad venues, and getting down to finishing trackwork. I am modifying Shinohara code 70 # 8 switches, to work on DCC.
I am using Micro engineering Code 70 flextrack and # 6 switches, but need some # 8s and also some # 4s on the logging branch, which ME does not offer. On the Shinoharas, I am changing to gapped PC board throw rods and connecting the running rails and closure rails with wire jumpers soldered to the bottom of the rails.
Modified Shinohara #8 code 70 switch
Also cutting gaps in the rail on either side of the frog, filling the gaps with CA glued plastic, formed to fit, and soldering a wire to the frog rails underneath to connect to a Tortoise switch machine contacts as the switch is thrown to guard against shorting.