Patent ID: 8210444

Claim:
In combination with a fixed substrate having a flat upper surface and with a track assembly including a flat plate having a pair of opposite end edges, a track on the plate, and fasteners securing the track to the plate, a direct-fixation mounting assembly comprising: an elastomeric pad of predetermined stiffness underneath the plate and atop the surface, whereby the track and plate bear downward via the pad on the surface; and a pair of end restraints each having a rigid outer part fixed to the substrate offset outward from a respective one of the end edges of the plate, a rigid inner part spaced inward from the outer part, generally of C-section, having an inwardly open groove fitted over the respective edge of the plate, and fixed to the respective outer end edge of the plate, and an elastomeric mass fixed to and between the respective inner and outer parts and of different elasticity than the pad.