FRA tape or Rail Car Tape is manufactured by several companies. It comes in yellow or white with yellow being the most popular. This tape is mandated by the FRA (federal railroad administration) for use on all rail cars. We have an article on placement under regulations on this site. FRA 224 tape is a not typed film, meaning it is not designed for signs. However, if it was typed it would be the equivalent of a type 5 film. The standard width for a roll is 4 inches.
FRA 224 retro reflective rail car film is produced by different manufacturers. The specifications sheets on this page are from Oralite. Others will have similar photo-metrics.
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oralite-r99-railcar-fra224-sheeting-technical-data-sheet 
Steven Cole (Economics, MBA – University of West Florida , Business & Innovation – Stanford University) 25 years of experience in the reflective safety business. Specializing in vehicle accident and rear end collision reduction through increased visibility.