Material handling car and track assembly, said assembly comprising: a car having wheels mounted thereon, and a track having two parallel rails, said wheel being adapted to roll on said rails to facilitate movement of said car along said track, a metal fin extending from an underside of said car and lengthwise of said car, and opposed magnet assemblies mounted between said tracks, said opposed assemblies being spaced from each other by a distance exceeding the thickness of said fin to define a gap between said magnet asemblies, said fin being adapted to pass through said gap in travel of said car over said magnets, each of said assemble is comprising a mounting bracket, a plate attached to said mounting bracket, and a series of magnets bonded to said plate, said magnets on said plate being disposed side by side in a direction of travel of said car on said rails, said magnets being operative sequentially to act on said fin to impart braking to said car. view more