Here is review of how I built my train shelves, complete details at OGR link below on post 36. It shows details for shelves under windows too.
https://ogrforum.ogaugerr.com/...ra-027-layout?page=4
Train Shelves - Economical, Wall Friendly and Moveable
Three wall, easy to build, economically, wall friendly and moveable train shelves were made in the 1980's and were installed in a hall ways and/or a spare bedrooms of three prior houses and the current house. Each shelve is made in two sections each to allow moving thru doors and up stairs. They also stand on the floor and are held to the wall by two 1" x 1" angles screwed into a wall stud per section, meaning only two small holes in the wall are required. The shelves are backed with 1/8" Masonite, with some strips of white felt glued to the back, to protect the wall. The shelves have router grooved surfaces to hold the train wheels and keep the cars and engines from rolling off. The design has one wider 1" x 6" wide shelve, one half way up and one wider 1" X 8" top shelf to allow display of wider accessories or other items in addition to the typical train cars and engines.
Construction is 1" x 4" straight pine #2 lumber with grooves routed in for train wheels. It is usually less expensive to buy 1x 4 x 8 ft long #2 common pine boards at Home Depot and picked through them to find straight boards. Knots are not that important to me as they can be filled in and painted over. The length of the shelves can be any you like up to 8 ft with this type of shelve boards. I place the shelves with a 4 1/2 in open space between each shelve. Mine are 7 ft 2 in tall and have 16 shelves with the bottom one 3 1/2 off the floor (about the height of my baseboards). They are nailed together with two 2 1/2 inch finish nails per shelf each end and have 1/8 " Masonite, nailed with 3/4" roofing nails every 6 inches on each shelve, on the back to keep the shape square, keep the shelves from sagging and to keep from marking wall. Pieces of white felt are glued on the back of Masonite to keep from marking wall also.
I filled knot holes and nail holes with DAP Plastic Wood Latex Based Wood Filler, Natural and primed the shelves and backing Masonite with Kilz primer probably oil based but would use latex now. I chose to paint the shelves glossy off white latex paint. I think the light color makes the train engines and cars show up better and makes the room brighter and more cheerful. I use a 3 in x 12 in piece of clear Saran Wrap on the shelf where an engines go to keep the white shelf clean of grease from the wheels.
View of one shelve shown below The 8 inch wide shelf is shown on top and one 6 inch wide shelf is in the middle with the picture framed pictures and milk car and cattle car accessories. There are some powered track to operate the accessories and operating cars on this shelf.
Charlie
