| 词条 | JNR Class ED74 |
| 释义 |
| name = Class ED74 | image = | alt = | caption = | powertype = Electric | builder = Mitsubishi | ordernumber = | serialnumber = | buildmodel = | builddate = 1962 | totalproduction = 6 | rebuilder = | rebuilddate = | numberrebuilt = | uicclass = Bo-Bo | gauge = {{RailGauge|1067mm}} | bogies = DT129 | wheeldiameter = {{Convert|1120|mm|ftin|abbr=on}} | minimumcurve = | wheelbase = | length = {{Convert|14300|mm|ftin|abbr=on}} | width = {{Convert|2805|mm|ftin|abbr=on}} | height = {{Convert|4260|mm|ftin|abbr=on}} | frametype = | axleload = | locoweight = 65.0 t | powersupply = | electricsystem = 20 kV AC, 60 Hz | collectionmethod = overhead wire | alternator = | generator = | tractionmotors = MT52 | headendpower = | transmission = | multipleworking = | maxspeed = | poweroutput = 1,900 kW | tractiveeffort = | factorofadhesion = | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | operator = JNR | numinclass = 6 | fleetnumbers = ED74 1–6 | axleloadclass = | locale = | deliverydate = 1962 | firstrundate = 1962 | lastrundate = | retiredate = | withdrawndate = | preservedunits = 0 | restoredate = | scrapdate = | currentowner = | disposition = All withdrawn | notes = }} The {{Nihongo|Class ED74|ED74形}} was a Bo-Bo wheel arrangement AC electric locomotive type operated by Japanese National Railways (JNR) in Japan between 1962 and the 1980s.[1] DesignThe Class ED74 was developed as a four-axle version of the six-axle (Bo-Bo-Bo) Class EF70 electric locomotives introduced a year earlier on the Hokuriku Main Line, and was intended for use on services north of {{STN|Fukui|Fukui}} where the gradients were easier.[2] HistoryA total of six locomotives were built by Mitsubishi in 1962, coinciding with the electrification of the Hokuriku Main Line between Fukui and {{STN|Kanazawa}}.[1][3] The six locomotives were delivered to Tsuruga Depot.[3] Displaced by the arrival of Class EF81 multi-voltage AC/DC electric locomotives, the Class EF74 locomotives were transferred to Kyushu in October 1968 for use on the recently electrified Nippo Main Line.[1][2] To enable use alongside the six axle (Bo-2-Bo) Class ED76 AC locomotives, a dead weight of 1.4 t was added to increase the axle load from 16.25 t to 16.8 t.[2] As the Class EF74 locomotives did not have steam generators and were unable to provide train heating for passenger services, they were mostly used on freight services between {{STN|Moji}} and {{STN|Oita}}, as well as on overnight sleeping car services that did not require a separate heating supply from the locomotive.[2] Despite electrification south to {{STN|Miyazaki}} in 1974, the Class EF74 locomotives were not allowed south of Oita due to their axle load, and were subsequently replaced by an additional build of Class ED76 locomotives.[2] The entire class was withdrawn by 1982.[2] Classification{{main|Japan Railways locomotive numbering and classification}}The ED74 classification for this locomotive type is explained below.
References1. ^1 2 {{cite book |last = Inoue|first = Koichi |script-title=ja: 国鉄機関車辞典 |trans-title=JNR Locomotive Encyclopedia |publisher = Sankaido |date = 1999 |location = Japan |pages = 142–143 |isbn = 978-4-381-10338-3|title = 国鉄機関車事典: 蒸気・電気・ディーゼル機関車66形式 }} {{Japanloco}}2. ^1 2 3 4 5 {{cite magazine|script-title=ja: 国鉄電気機関車の系譜|trans-title=JNR Electric Locomotive Lineage |magazine = Railway Journal |volume = 51|issue = 610 |page = 149 |publisher = Tetsudo Journal |location = Japan |language= Japanese |date = August 2017}} 3. ^1 {{cite magazine|script-title=ja: 交流電気機関車ED74 |trans-title=AC electric locomotive ED74 |magazine=Japan Railfan Magazine |volume = 3|issue = 19|page =15 |publisher = Koyusha Co., Ltd. |location = Japan |language= Japanese |date = January 1963}} 5 : Electric locomotives of Japan|Bo-Bo locomotives|Mitsubishi locomotives|1067 mm gauge locomotives of Japan|Railway locomotives introduced in 1962 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。