PDFWAC 296-860-20080
Follow these requirements to conduct narrow gauge rail operations.
(1) You must base your clearance measurements upon your widest narrow gauge cars.
(2) You must make sure the distance between the cars and objects on narrow gauge track is equal to or greater than the distance required between ten foot ten inch wide cars and other cars or objects on standard gauge track.
(3) You must comply with all other applicable requirements in this chapter.