The side rods for the small diesel switchers, LGB or Bachmann, are hard to replace with NOS parts. Frustrated with that effort, and motivated as a result, I went to Home Depot and bought some 3/8" wide flat aluminum stock. With the one remaining undamaged side rod, I closely duplicated new ones using a bench vise, course file, and 320 grit wet/dry sandpaper. A brief rub out with Blue Magic metal polish gave a classy sheen to the rods. I did accomodate the varied up/down wheel motion by drilling and filing a slightly oblong opening in the rods. For certain, the metal means there is little chance of breakage.
Wendell