Under the Whyte notation for the classification of steam locomotives, 0-4-2 represents the wheel arrangement with no leading wheels, four powered and coupled driving wheels on two axles and two trailing wheels on one axle.

2024年10月23日 · 对于不确定度u=0.2% (k=2)的理解： 1. **不确定度u**：这里的u表示标准不确定度，它是对测量结果分散性的估计。标准不确定度通常以相对形式给出，即相对于测量值的百分比。 2. **0.2%**：这表示标准不确定度为测量值的0.2%。

Originally built for William Burkitt as a 2-2-2WT type. Acquired by Thomas W. Ward in 1910. Previously operated in 1970. Owned by the National Railway Museum York. Smallest surviving standard gauge steam locomotive in the UK. Named Chaka's Kraal.

To provide proper power for the underground section of the Metropolitan Railway, Patrick Stirling designed a locomotive similar to those that Sturrock had supplied several years earlier. A big difference, however, was the 13-ft gap between the second driving axle and the auxiliary axle that supported the tank and bunker.

Best known as the title locomotive in 1953's Titfield Thunderbolt. Its last self-propelled appearance came in 1988, after which it went on display first at the Museum of Science and Industry in Manchester and ultimately the Museum of Liverpool.

The 0-4-2 Tank is a steam locomotive in the UK Railway Set. Locomotive flips direction when train reverses. These short-range little tank engines were widely used on lesser branch lines well into the 20th century. The PJ1K model has stats based …

Two basic 0-4-2 saddle tanks, 91 & 92, were built by Beyer Peacock in 1857 and in 1877/8 one good one, 92, was made from the two. It was rebuilt as an 0-4-0ST in 1878, and in 1893 received a very major rebuild at Wolverhampton. Astonishingly it then survived until 1942, albeit only as a stationary engine in its latter years.

The wheel arrangement 0-4-2 refers to a steam locomotive with two coupled axles and one trailing axle. The name “Olomana” used in North America came from a small narrow-gauge tank locomotive in Hawaii that Baldwin built in 1883.

Lion was an early Liverpool & Manchester Railway (LMR) locomotive which was built by Todd, Kidson & Laird in 1838 and entered service as L&MR 57. It was one of two engines built in 1838 to haul freight on the line – the other was 58 Tiger. Todd, Kitson & Laird built another two 0-4-2 locomotives for the LMR in 1939 (Elephant and Buffalo).

2022年6月16日 · U是不确定度，允许误差，准确度K=2,k是一个因子,表示西格玛值的倍数. 正态分布k=2时,置信概率为95%.目前大部分仪器的k值都是2.要校准证书中通常都会注明所用的仪器设备的U值和k值. 问题不很明确。 Urel是扩展不确定度（相对）问题不很明确。 根据相关检定，其示值误差必须往正方向调整，调整为2.0.经过调整后，再次检定Q min 、Q max 和0.2Q max 示值误差，结果显示为-2.0、-0.8和+0.8，符合相关标准要求。 电压的测量利用示波器所做的任何测 …