on the Su locomotive. The suffix 'u' means which translates as "strengthened" or "uprated". Several Su-series locomotives are preserved in working order. However, only one pre-revolutionary S-series locomotive is still around, number S.68. It is preserved at the Saint Petersburg railway museum. The Su was the standard passenger engine on most mainline routes and it was only on the key trunk lines that the IS class 2-8-4, or later the P36 4-8-4, would be used. Therefore, the majority of passenger miles were hauled by an Su (Су). Visually, the Su was the last true Russian-look design before the American influence of high running boards, bar frames and boxpok wheels became the norm. The Su retained such features as a clerestory skylight in the cab roof and handrails on the outside of the running board. These handrails were a result of the harsh Russian winters, when ice would build up on the running boards, making them highly dangerous. Enginemen had fallen to their death from moving trains and the fitting of promenade deck style handrails was a safety measure ordered by the Tsar in pre-revolutionary times. These features, combined with the high loading gauge, combined to give the locomotives a uniquely Russian appearance. South Africa The world's first 2-6-2 Prairie type locomotives were also the first locomotives to enter service on the new Cape gauge mainline of the Cape Government Railways. They were 2-6-2 side-tank engines that were delivered between 1875 and 1879. Four-wheeled tenders were also acquired on a subsequent order and the locomotives could be operated in either a tank or tank-and-tender configuration, as circumstances demanded. These locomotives were later designated the Cape 2nd Class. In 1901, the Zululand Railway Company, contracted for the construction of the Natal North Coast line from Verulam to the Tugela River, acquired one 2-6-2 side-tank locomotive as construction engine from Baldwin Locomotive Works. Upon completion of the line in 1903, the locomotive was taken onto the roster of the Natal Government Railways and was designated Class I. The first four Prairie locomotives built for the Cape Government Railways (CGR) by Neilson, Reid and Company, later designated Class 6Z on the South African Railways (SAR), were placed in service in 1901, but they displayed the Prairie's tendency to be unsteady at speed. They were therefore soon modified to a 2-6-4 Adriatic wheel arrangement. With an improved design of bissel truck, two more CGR locomotives