This has been described in MR and elsewhere before, but for the sake of those who might have missed it or for newcomers to the hobby, a description of it bears repeating because it works so well. In fact, these free-floating pads have Worked so well on my HO scale layout that I no longer find it necessary to clean the rails by hand.
Not having at hand a detailed description of John’s pad design or mounting methods, I endeavored to create my own. I use 1/8-inch Masonite (either tempered or untempered) for the pad. Each car assembly consists of a Masonite rectangle 1-inch wide by 1 1/2-inches long with its edges beveled slightly with fine sandpaper. The bevels reduce the possibility of a pad TW catching on a switch point, frog, or crossing. Then, using 5-minute epoxy, I glue two flathead machine screws as shown in the drawing.
Next I drill a pair of 5/32-inch holes, also 5/8-inches apart, through the underframe of a boxcar to accept the screws. These holes are slightly larger than the diameter of the machine screws so the pads “float” along the rails without being permanently attached to the cars. Thus, the pressure of the pad on the rails is determined by the weight of the screws and pad alone. The screws simply hold the pad in position under the car while the car guides the pads along the rails.
To disguise the pads a little, I paint them fiat black. In the shadow of the car they can hardly be seen.
And to clean the track cleaner, I simply rub it back and forth across a piece of fine sandpaper a few times and it’s ready to go again.
That’s it, as quick and easy as it sounds. With this method you can operate the cleaning cars right along with the rest of your equipment. And they can easily be removed if you wish to run the cars without the cleaning pads.