WAC 296-24-75011: Railing, toeboards, and cover specifications. (1) You must ensure that a standard railing consists of top rail, intermediate rail, and posts, and has a vertical height of forty-two inches, plus or minus three inches, from upper surface of top rail to floor, platform, runway, or ramp level and: (a) The top rail must be smooth-surfaced throughout the length of the railing. (b) The..