UIC 506 Ed. 2 (2008)
UIC 506 Ed. 2 (2008) Rules Governing Application Of The Enlarged Ga, Gb, Gb1, Gb2, Gc And Gi3 Gauges Describes the rules for gauges GA, GB, GC, GB1 and GB2 which are larger in the upper part and gauge GI3 which is larger in the lower part.