Edit Add ELFA Shelving Installation instructions. Note ELFA Shelving reference in this thread.
Installation instructions Glenn Snyder Shelving. . Each shelf has the ability to support a lot of weight. Use the #10 X1 1/2" screws/properly installed in the center of each wall stud (4) minimum per (6ft section, studs 2 ft centers.)
O-scale track from the website $2.50/ft (6 ft sections). plus shipping. Cuts (to length) are $1 each. Shipping of cuts includes the scrap.
Edit add Showcase express One shelf (4 ft)length enclosed $20/ft (4) shelves enclosed (4ft)length $17.18/ft. Add shipping.
GSDS.com
Installation Instructions
Glenn Snyder Display Systems are easy to install. You
will need the following tools: An electric drill, 1/8" and
3/16" drill bits, a level, #10 x 1-1/2" round head, pan
head or truss head sheet metal screws for each stud
and spacing blocks. Spacing blocks should be as high
as the distance between the shelves, generally between
5-1/2" or 6" for O gauge. Studs are usually located 16" or 24" apart on
center. Electrical outlets are generally attached to the side of a stud, which
is the easiest way to locate one, or may be found with a magnetic stud
finder.
Installation Instructions: Using the level, draw a line where you would like
the bottom shelf to be located. Locate the studs along this line. Mark the
stud spacing and transfer the marks to the back of the shelf. Using the
3/16"drill bit, drill clearance holes in the shelf from the back, using the
groove to locate the tip of the drill bit. Using the1/8" drill bit, drill pilot holes
in the studs and fasten your shelf with the #10x1-1/2" long sheet metal
screws. (We use them instead of wood screws as they are threaded to the
top of the screw giving them more fastening power.) Once the bottom shelf
is fastened, place the spacing blocks on the top of the rails, equal distance
apart. Place the next shelf on top of the blocks and mark where each
fastener hole is to be drilled. Remove the shelf, drill the holes in the shelf
and in the studs and attach the second shelf. Continue installing the
shelving by using the spacing blocks until installation is complete.
Use of Connecting Pins: On walls where longer shelves are needed or
uneven areas, use the connecting pins that are supplied. Tap ends of pins
open with a center punch or similar tool. Slide one end onto a rail and
gently tap it with a hammer until the pin is all the way on the rail. Take the
second shelf and locate the open end of the pin on the Corresponding rail.
Tap the pin halfway back until the two shelves meet, then fasten the shelf
to the wall. If your walls are uneven, place screws through washers where
needed between the shelf and the wall until the shelving remains straight
when the screws are tightened.