|Fits Trutrack gauge track Four Curved roadbed track ballast. For Lionel Trutrack system, easy, snap-lock assembly to track. Snaps onto each track piece separately. Layout can be disassembled with out removing ballast from track. Can be set up permanently or temporarily, offering epual performance either way. For use with Lionel Trutrack systems only. New old stock in the original sealed packaging. Great Lionel collector item.