These are very nice resin castings .  This style of number boards were used the Missouri Pacific  union pacific and other roads as well for the Baldwin  As 15 th AS 6 1 6 models.after the railroads retired them and others purchased then , they ran them in this configuration.   You get  4 pcs   Models will have to be modified to add  them . Size .645 w x .245 h x .190 d
 
Note select Standard shipping  -- $12.50  at ------- Check out