630 V DC railway electrification (Q12646283)
railway electrification system used in London Underground
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Current Data About 630 V DC railway electrification
(P31) (Q11581821)

(P279) (Q159241)

(P1282) Tag:electrified=4th_rail

Tag:voltage=630

Tag:frequency=0

(P2144)
(P2283) (Q109180474)

(P2436) 630

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description railway electrification system used in London Underground