Cork Roadbed for HO railroads. 0.75" wide square-edged strip. Use caulk to create the slope if desired. Cork deadens sound and provides an excellent spiking medium.
This is a roll of cork, 48 feet long. Several rolls can be shipped inexpensively compared to 36" long strips. Price is per roll measuring 0.75" wide, photo shows two rolls. Two 0.75" strips laid side by side provide a single length of 24+ feet of HO roadbed per roll.
Custom widths can be special ordered, but only 6mm thickness is currently available.
See LR-CRS for traditional strips, LR-CS6 for 6x26" Sheets, and LR-CTP for cork roadbed pads for use under turnouts and crossovers.
