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Both of the Northern Pacific's 2-6-6-2 classes were copies of GN designs, including their Belpaire fireboxes, a rarity on NP steam locomotives. NP 3015, last of the Class Z's, had a troubled existence, suffering a crown sheet failure at Kennedy, Washington , on Stampede Pass circa 1916, then later derailing on the Wallace Branch in Idaho in 1933.
Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive. In the Whyte notation for classifying steam locomotives by wheel arrangement, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by two sets of six coupled driving wheels and four trailing wheels . 4-6-6-4's are commonly known as Challengers .
The neper (symbol: Np) is a logarithmic unit for ratios of measurements of physical field and power quantities, such as gain and loss of electronic signals. The unit's name is derived from the name of John Napier, the inventor of logarithms. As is the case for the decibel and bel, the neper is a unit defined in the international standard ISO 80000.
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In September 1904, the C&NW asked ALCO to construct one D class 4-4-2 (No. 1300) and one R-1 class 4-6-0 (No. 76) with superheated boilers. [ 4 ] [ 11 ] After they entered service, the C&NW became unsatisfied with their performance, and no further Ds or R-1s were built new with superheaters.
The C&NW subsequently asked ALCO to construct one D class 4-4-2 (No. 1300) and one R-1 class 4-6-0 (No. 76) with superheated boilers. [ 3 ] [ 4 ] The railroad became unsatisfied with the performance of Nos. 1300 and 76, and no further D's or R-1's were built new with superheaters.
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