1:174 (half HO) 1:87 - ( HO ) 1:64 - (S Scale) 1:48 - ( O ) 1:32 - ( Gauge 1 ) 1:29 - (Aristo) 1:24 - (1/2") 1:22.5 - (LGB G Scale) 1:20.3 - ( 15mm ) 1:19 - ( 16mm ) 1:13.7 - ( 7/8" ) 1:8 - (1-1/2")