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Duplex Steam Locomotive / Steam discussion

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[quote]QUOTE: Originally posted by wallyworld One of the interesting aspects of the T1 and Q2 story is the watershed moment that the PRR shed it's very conservative approach of incremental development of steam development that was backed by extensive testing to move forward so rapidly with the ordering of production of the T1. It's interesting that the NYC feeling the same economic pressures and onslaught of the GM juggernaut came up with the Niagara which was a viable and competitive design based on more traditional design approach. Same for the successful N&W designs which were rejected for development by the PRR. I wi***hat the excellent Black Gold\Black Diamonds book went further into detail on this aspect on a more technical basis. Are there any books anyone can reccomend that analyse this comparison. The Red Devil book did so on a technical basis but I am more intersted in a comparison of corporate design goals based on their reactions to trends in their market. [/quote] The Staufer NYC Later Power book says the Niagra was intended as a dual-service replacement for the 4-8-2 Mohawks which were also used in both roles. NYC used both classes of power on secondary passenger trains because they were much longer and heavier than the limiteds and more than the Hudsons could handle. The first Niagra was tested with 75" & 79" drivers and 79's were used on the rest mainly for greater economy. The last Niagra built had poppet valves and there were plans for a Duplex version. The book indicates that the Niagras weren't all that advanced in terms of Superpower appliances, just big efficient boilers and well balanced, low maintenance running gear that could rack up 27,000 miles a month, so it seems NYC-Alco was trying to match the reliability of the diesel rather than beating the speed of the Hudsons.
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