| 词条 | Baltimore and Ohio class N-1 |
| 释义 |
| name = B&O #5600 George H. Emerson | powertype = Steam | image = Baltimore and Ohio Duplex.jpg | caption = Baltimore and Ohio Railroad #5600 George H. Emerson | builder = B&O Mount Clare Shops | builddate = May 1937 | totalproduction = 1 | whytetype = 4-4-4-4 | uicclass = 2′BB2′ | gauge = {{Track gauge|ussg|allk=on}} | leadingdiameter = {{convert|36|in|mm|0|abbr=on}} | driverdiameter = {{convert|76|in|mm|0|abbr=on}} | trailingdiameter = {{convert|42|in|mm|0|abbr=on}} | minimumcurve = 13° or {{convert|441.68|ft|m|abbr=on}} normal, 18° or {{convert|319.62|ft|m|abbr=on}} slow | length = {{convert|117|ft|0+1/4|in|m|2|abbr=on}} | width = | height = | weightondrivers = {{convert|238000|lb|kg t|abbr=in|sp=us}} | locoweight = {{convert|386500|lb|kg t|abbr=in|sp=us}} | tenderweight = {{convert|350000|lb|kg t|abbr=in|sp=us}} | locotenderweight = {{convert|736500|lb|kg t|abbr=in|sp=us}} | tendertype = Vanderbilt with two 3-axle trucks | fueltype = Coal | fuelcap = {{convert|46000|lb|kg t|abbr=in|sp=us}} | watercap = {{convert|22000|usgal|abbr=on}} | boilerpressure = {{convert|350|lbf/in2|MPa|2|abbr=on}} | firearea = {{convert|80.5|sqft|m2|abbr=on}} | fireboxarea = {{convert|677|sqft|m2|abbr=on}} | tubesandflues = {{convert|4220|sqft|m2|abbr=on}} | totalsurface = {{convert|4897|sqft|m2|abbr=on}} | superheatertype = B&O | superheaterarea = {{convert|1312|sqft|m2|abbr=on}} | cylindercount = Four, duplex | cylindersize = {{Convert|18|x|26.5|in|mm|0|abbr=on}} | valvegear = Walschaerts | tractiveeffort = {{convert|65000|lbf|kN|1|abbr=on}} | factorofadhesion = 3.66 | poweroutput = {{convert|3936|hp|kW|abbr=on}} at cylinders | operator = Baltimore and Ohio Railroad | operatorclass = N-1 | fleetnumbers = 5600 | officialname = George H. Emerson | retiredate = 1943 | scrapdate = October 1950 }} The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This allowed the locomotive's wheelbase to remain the same. The space beside the firebox was hot and dirty, which caused premature cylinder wear, and the placement of the cylinders limited the size of the firebox. These same problems occurred on the PRR Q1, which also placed the rear cylinders by the firebox. References
9 : Baltimore and Ohio locomotives|4-4-4-4 locomotives|Duplex locomotives|Experimental locomotives|Railway locomotives introduced in 1937|Steam locomotives of the United States|Scrapped locomotives|Passenger locomotives|Standard gauge locomotives of the United States |
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