| 词条 | Pennsylvania Railroad class D2 |
| 释义 |
|name = PRR D2 & D2a |powertype = Steam |image = PRR D2a 138.jpg |caption = Class B A #138 (later class D2a) |builder = PRR Altoona Works |builddate = 1868–1872 (D2); 1881–1882 (D2a) |totalproduction = 20 (D2); 45 (D2a) |whytetype = 4-4-0 |uicclass = 2′B |gauge = {{track gauge|ussg}} |leadingdiameter = {{convert|28|in|mm|0|abbr=on}} (D2)[1] {{convert|30|in|mm|0|abbr=on}} (D2a)[1] |driverdiameter = {{convert|62|in|mm|0|abbr=on}} (D2)[1] {{convert|68|in|mm|0|abbr=on}} (D2a)[1] |wheelbase = {{convert|22|ft|5+5/8|in|m|2|abbr=on}}[1][6] |length = {{convert|54|ft|5.44|in|m|2|abbr=on}}[1][2] |width = {{convert|9|ft|0.94|in|m|2|abbr=on}}[1][2] |height = {{convert|14|ft|8|in|m|2|abbr=on}} (D2)[2] {{convert|14|ft|11|in|m|2|abbr=on}} (D2a)[1] |weightondrivers = {{convert|52500|lb|t|1|abbr=in}} (D2)[2] {{convert|53750|lb|t|1|abbr=in}} (D2a)[1] |locoweight = {{convert|80500|lb|t|1|abbr=in}} (D2)[2] {{convert|82200|lb|t|1|abbr=in}} (D2a)[1] |tenderweight = {{convert|51400|lb|t|1|abbr=in}} (D2 & D2a)[1][2] |locotenderweight = {{convert|131900|lb|t|1|abbr=in}} (D2)[2] {{convert|133600|lb|t|1|abbr=in}}[1] |tendertype = Eight-wheel with water scoop |fueltype = Soft coal |fuelcap = {{convert|8000|lb|t|1|abbr=in}}[2] |watercap = {{convert|2400|usgal|abbr=on}}[2] }}
The Pennsylvania Railroad's steam locomotive class D2 (formerly Class B, pre-1895) comprised twenty 4-4-0 locomotives intended for mountain passenger helper service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1869–1880. [3] They were the second standardized class of locomotives on the railroad and shared many parts with other standard classes.[4] This design differed from the Class A (later D1) mainly in its smaller drivers for greater tractive effort in mountainous terrain. Like all the early standardized 4-4-0s on the PRR, the Class B had a wagon-top boiler with steam dome and a firebox between the two driving axles. In 1881, the PRR took the Class B design and modified it to produce more locomotives for express passenger service, with {{convert|68|in|mm|0|adj=on}} drivers like the earlier Class A. These new locomotives were designated Class B A, and were classified as B2a in the post-1895 scheme; forty-five of them were constructed.[3][5] References1. ^1 2 3 4 5 6 7 8 9 {{cite web |title = Class D2 diagram |url = http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=d2a_oldba.gif&sel=ste&sz=sm&fr= |author = Pennsylvania Railroad |publisher = PRR.Railfan.net |accessdate = 2008-08-19}} {{Commons category|Pennsylvania Railroad D2}}{{PRR locomotives}}{{DEFAULTSORT:Prr D02}}2. ^1 2 3 4 5 6 7 8 9 {{cite web |title = Class D2a diagram |url = http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=d2.gif&sel=ste&sz=sm&fr= |author = Pennsylvania Railroad |publisher = PRR.Railfan.net |accessdate = 2008-08-19}} 3. ^1 {{cite web |title = PRR Steam Roster |url = http://www.northeast.railfan.net/prr_steam2.html |work = Northeast Rails |accessdate = 2007-12-31}} 4. ^1 2 {{cite book |title = The Pennsylvania Railroad |first = James |last = Dredge |year = 1879 |publisher = Engineering magazine |location = London}} 5. ^{{cite book |title = Motive Power Development on the Pennsylvania Railroad System |first = Paul T. |last = Warner |year = 1924 |publisher = Baldwin Locomotive Works |location = Philadelphia}} 6 : 4-4-0 locomotives|Pennsylvania Railroad locomotives|Railway locomotives introduced in 1869|Scrapped locomotives|Standard gauge locomotives of the United States|Steam locomotives of the United States |
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