South African Railways class 12R brass cab side number plate 1878 12R. The last of the class of 46 Class 12 4-6-2 locomotives built by Beyer Peacock in 1921. All 46 Class 12 locomotives were eventually reboilered with Watson Standard no. 2 boilers and reclassified to Class 12R. In the process, they were also equipped with Watson cabs with their distinctive slanted fronts to facilitate access to the firebox side stays. In Ex loco condition, measures 20.5in x 14.25in.