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The Mikado type was, in turn, ousted from the top-flight trains by larger freight locomotive wheel arrangements such as the 2-8-4, 2-10-2, 2-10-4 and articulated locomotives, but no successor type became ubiquitous and the Mike remained the most common road freight locomotive with most railroads until the end of steam. More than 14,000 were ...
A preserved GWR 4500 Class steam locomotive, showing power classification "C" on a yellow route restriction disc, on the upper cab side-sheet. On 1 July 1905 the Great Western Railway (GWR) introduced a system for denoting both the haulage capabilities and the weight restrictions which applied to their various classes of locomotive.
The earliest British use of the 2-4-2 wheel arrangement appears to have been no. 21 White Raven, supplied to the St Helens Railway by James Cross of Sutton Works in 1863. It was soon rebuilt as a 2-4-0 tender locomotive and eventually passed into the stock of the London and North Western Railway (L&NWR).
The way the valve controlled the steam entering and leaving the cylinder was known as steam distribution and shown by the shape of the indicator diagram. What happened to the steam inside the cylinder was assessed separately from what happened in the boiler and how much friction the moving machinery had to cope with.
The Milwaukee Road saw immediate cost savings over the steam locomotives previously in use, as the Bipolars could run from Tacoma to Othello without stopping for servicing and could haul trains up grades that had required double-heading steam engines. E-2 on display in 2008
They now turned their attention to a requirement for a more powerful branchline goods locomotive, and in 1922 produced a lighter 2-8-0 "Consolidation" locomotive with a 13 + 1 ⁄ 2 long tons (13.7 t; 15.1 short tons) axle load and 50 ft (15.24 m) wheelbase, able to run on even the lightest lines on the VR 5 ft 3 in (1,600 mm) system.
“The cost of a duplex is not twice the cost of a single unit and the cost of a triplex is not triple the cost of a single unit,” Moss said. “It could be a big net win for a potential buyer.”
The costs of running extra steam locomotives were eliminated, and average train speeds increased because it was no longer necessary to attach and detach the locomotives. In Britain, the Midland Railway used to use double-heading often, because it built only small, light locomotives , which were often not powerful enough to haul the trains alone.