Marklin 7391 - Track bumper

Model Length 38 mm / 1-1/2". The track bumper can be clipped onto the rails. This is intended for K-track.

A wood screw for installation is included. 

Charlie's Tip: With a small modification, this can be used on C-track. You would have to cut down the screw hole extending out the bottom of the bumper, and glue the bumper in place. 

With C-track you could not use the screw hole to fasten the bumper onto the track, unless you elect to drill through the center rail mounted underneath.