If you are building a Layout buy a Digital Camera and record everything you do, you will find it was well worth it. Maybe you will have a website and put your work out to the world. You don't need an expensive camera, only the first two shots were done with more than a Kodak DX3600 2.2 megapixel camera. I have tried to extrapolate the building of my trestle because I did not take pictures of everything I did. I hope this helps someone.
Trace around a piece of Snaptrack to get the location of the ties.
Rubber Cement ties to the template. I placed PC Board ties every fifth one to solder the bridge to the rails. I use S scale ties from Clover House, they match the Code 100 ties of the Atlas track.
Assemble the trestle upside down on the ties cemented to the template. The bridge should span a distance inside the rail joints on the Snaptrack section. I cut my own stripwood on a table saw. The following sizes are used, scale inches :
Piles: 12" Dia
Stringers: 6x12's the timbers under the rails
Caps on the Piles: 12x12's over the piles that support the stringers
Ties: .140 x .105 real inches to match the Clover House PC ties
I stain the stripwood with an India Ink and water solution
Make sure the track pieces are level, I found the short piece connecting the turnout to the Bridge piece was bowed after assembly. I had difficulty bending it down.
Strip the ties off the Snaptrack and slide the trestle under the rails. Shim up the trestle so the rails contact the PC Ties. Solder the trestle to the rails, and cut the copper clad to isolate the rails. Fill in the cuts with a filler.
Make retaining walls with 1/4" Diameter piles and 4x12 planks. Paint the PC Board Ties flat white and stain them with a diluted waterproof India Ink solution.
I made the cribbing with 3/16" Diameter x 3/8" long dowels glued to the plaster scenery as the protruding timbers and 3/16" x 2" long dowels as the cribbing. Then fill in the area behind the cribbing with paver sand and glue in place with a diluted white glue mixture.
The trestle finished. My scenery is Hydrocal covered with a layer of Structolite troweled on as a scenery texture. The ground cover is paver sand from Home Depot.