The R143 and R160 subway cars are very similar except for the position of the USA flag on the cab ends. The R27 and R30 subway cars were very similar. The R26, R28, R33, and R36 subway cars were very similar. The differences between the R44 and R46 subway cars were the trucks (bogies) but the trucks on the R46 subway cars were defective and had to be replaced by trucks similar to those on R44 subway cars. I didn't want to create 3D models of each and every subway cars unless there are visible differences such as R32 and R38 subway cars having different bodies. I don't want to create each and every Chevrolet cars from 1912 to 2007!