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The Plummer 3-dimensional density profile is given by = (+) /, where is the total mass of the cluster, and a is the Plummer radius, a scale parameter that sets the size of the cluster core. The corresponding potential is Φ P ( r ) = − G M 0 r 2 + a 2 , {\displaystyle \Phi _{P}(r)=-{\frac {GM_{0}}{\sqrt {r^{2}+a^{2}}}},} where G is Newton 's ...
The National 2.5 in Gauge Association continues to support live steam passenger hauling in 2.5-inch gauge using MES tracks. They use a "scale" appropriate to the original prototype modelling both standard and narrow gauge locomotives to run on 2.5-inch track. -1:16: 3 + 1 ⁄ 2 in (89 mm) A worldwide garden railroad scale.
They were connected to 81-inch (2,057 mm) driving wheels by a variety of valve gear: most had Stephenson valve gear and 11-inch (279 mm) piston valves; No. 1026 was fitted up with Youngs rotary valves and valve gear in 1903, [1] but later reverted to Stephensons valve gear.
Gauges from 10 in (254 mm) and up are called "Miniature Railways" (in the US these are known as "Grand Scale Railroads"), and are used mostly in amusement park rides and commercial settings. Often the gauge has little to do with the scale of a locomotive since larger equipment can be built in a narrow gauge railway configuration.
This is a 2-4-4 Mason Bogie. Note the deep firebox permitted by this configuration, and the high reversing shaft (below the bell) with a long lifting link to the valve gear radius rod. 2-4-4T Mason Bogie #10. Mason Machine Works, Taunton, MA. Built 1887. Photo location: Behind the Lynn, MA Train Station of the Boston, Revere Beach and Lynn ...
PIKO manufactures more than 1,500 [3] products in various model train scales: . G-Scale: American and European-prototype weather-resistant models for indoor and outdoor use, including starter sets, locomotives, passenger and freight cars, track, buildings, controls and accessories.
The Birmingham gauge is also known as the Stubs Iron Wire Gauge or Birmingham Wire Gauge and is distinct from the Stubs Steel Wire Gauge and the British Standard Wire Gauge. It is commonly referred to simply as gauge (abbreviated as G ), [ 3 ] but this should not be confused with the French gauge , a separate system used for measuring the outer ...
K5 #5698 used conventional Walschaerts valve gear and piston valves, and developed a starting tractive effort of 54,675 lbf (243.21 kN). During the New York World’s Fair of 1939-40, K5 5698 was displayed along with several other PRR locomotives at the fair.