Ku qor magacyada dhammaan khadadka dhulka hoostiisa mara ee London, si alifbeet ahaan ah
Context:London Underground's kow iyo toban khad ayaa wadar ahaan dhererkoodu yahay 402 km (250 mi), taasoo ka dhigaysa nidaamka metrooga toddobaad ee ugu dheer adduunka. Kuwani waxay ka kooban yihiin shabakada dhulka hoostiisa iyo khadadka tuubada qoto dheer. Wadooyinka Circle, District, Hammersmith & City, iyo Metropolitan waxay sameeyaan shabakad dhulka hoostiisa ah, oo leh tunelada tareenka ee ka hooseeya dusha sare iyo cabir la mid ah kuwa ku yaal khadadka waaweyn ee Ingiriiska, oo ku kulmaya wareeg wareegsan oo laba dhinac ah oo ku wareegsan aagga 1. Khadadka Hammersmith & City iyo Circle waxay wadaagaan saldhigyada iyo inta badan raadkooda midba midka kale, iyo sidoo kale khadadka Metropolitan iyo District. Khadadka Bakerloo, Central, Jubilee, Northern, Piccadilly, Victoria iyo Waterloo & City waa tuubooyin heer sare ah, oo leh tareeno yaryar oo ku socda laba tunel wareeg ah (tuubooyin) oo dhexroorkoodu yahay qiyaastii 11 fuudh 8 inji (3.56 m). Khadadani waxay leeyihiin isticmaalka gaarka ah ee laba wado, marka laga reebo laanta Uxbridge ee khadka Piccadilly, oo la wadaagaya wadada laanta Degmada ee u dhexeysa Acton Town iyo Hanger Lane Junction iyo khadka Metropolitan ee u dhexeeya Rayners Lane iyo Uxbridge; iyo khadka Bakerloo, oo la wadaagaya wadada laanta Watford DC Line ee London Overground ee qaybteeda sare ee waqooyiga Queen's Park.  Nidaamka boqolkiiba 55 wuxuu ku shaqeeyaa dusha sare. Waxaa jira 20 mayl (32 km) oo tunnel ah oo la jarjaray oo la daboolay iyo 93 mayl (150 km) oo tunnel tube ah. Qaar badan oo ka mid ah saldhigyada dhulka hoostiisa mara ee bartamaha London ee waddooyinka dhulka hoostiisa mara ee qoto dheer ayaa ka sarreeya khadadka socodka si ay u caawiyaan hoos u dhigista markay yimaadaan iyo dardargelinta markay baxayaan. Tareenadu waxay sida caadiga ah ku socdaan wadada bidix. Meelaha qaarkood, tunelada ayaa midba midka kale ka sarreeya (tusaale ahaan, khadka dhexe ee bariga saldhigga St Paul), ama tunelada socda ayaa midigta ah (tusaale ahaan khadka Victoria ee u dhexeeya Warren Street iyo King's Cross St. Pancras, si loogu oggolaado is-weydaarsiga is-weydaarsiga khadka Waqooyiga ee Euston).  Khadadka waxaa koronto ku shaqeeya nidaam afar-tareen oo DC ah: tareenka dhexmara tareenka waxaa lagu dhajiyaa -210 V iyo tareenka ka baxsan tareenka socda ee +420 V, taasoo siinaysa kala duwanaansho awood ah oo ah 630 V. Qeybaha khadka la wadaago tareennada khadka weyn, sida khadka Degmada ee East Putney ilaa Wimbledon iyo Gunnersbury ilaa Richmond, iyo khadka Bakerloo ee waqooyiga Queen's Park, tareenka dhexe wuxuu ku xiran yahay tareenka socda.  Xawaaraha celceliska ee tareenka dhulka hoostiisa mara waa 20.5 mph (33.0 km/h). Marka laga reebo tunelada bartamaha London, tareenada khadadka badan waxay u muuqdaan inay ku safraan in ka badan 40 mph (64 km / saacaddii) magaalooyinka hoostooda iyo miyiga. Khadka Metropolitan wuxuu gaari karaa xawaare dhan 62 mph (100 km/h).
1aad. Bakirloo 2aad. Xarunta dhexe Saddexaad. Wareeg 4. waxay Degmada 5aad. Hammersmit iyo Magaalada Lix. Sannad guurada 7 (Toddobo) London oo dhulka korkiisa ah 8 (Sideed) Magaalada weyn Sagaal Waqooyiga Tobankii Magaalada Piccadilly Waxaa jira 11. Fiktooriya Waxaa jira 12 Waterloo iyo Magaalada