| Blue Line |
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| Other name(s) | Seagull Line |
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| Native name | Linha Azul |
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| Owner | Government-owned corporation |
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| Locale | Lisbon Amadora
Portugal |
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| Termini | Reboleira Santa Apolónia |
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| Connecting lines | 
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| Stations | 18 |
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| Type | Rapid Transit |
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| System | Metropolitano de Lisboa |
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| Operator(s) | Metropolitano de Lisboa, EPE |
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| Rolling stock | ML90, ML95, ML97, ML99 |
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| Opened | 29 December 1959 (1959-12-29) (original network) 15 July 1995 (1995-07-15) (independent line) |
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| Line length | 14 km (8.7 mi) |
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| Character | Underground subway |
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| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) standard gauge |
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| Electrification | 750 V DC third rail |
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Route map |
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13,724 |
Reboleira ⇄ L. Sintra: Reboleira |
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× Sorefame |
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12,765 |
Amadora Este |
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Alfornelos |
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⇡ 0AMD0 ⇣ 0ODV0 |
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⇡ 0ODV0 ⇣ 0LSB0 |
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branch line→ PMO III |
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10,747 |
Pontinha |
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PMO III Pontinha |
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09,927 |
Carnide |
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09,146 |
Colégio Militar/Luz |
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Alto dos Moinhos |
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Laranjeiras |
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PMO I Sete Rios(closed) |
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⇄ L. Cintura: Sete Rios |
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06,591 |
Jardim Zoológico(until 1995 Sete Rios) |
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× L. Cintura |
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Praça de Espanha(until 1995 Palhavã) |
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branch line→ PMO I (closed) |
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Red Line→ Campolide |
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× Red Line |
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branch line→ Red Line |
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São Sebastião⇄ Red Line |
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Red Line→ Saldanha |
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Parque |
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Yellow Line→ Picoas |
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× Yellow Line |
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03,791 |
Marquês de Pombal(until 1995 Rotunda) ⇄ Yellow Line |
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Yellow Line→ Rato |
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Avenida |
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02,691 |
Restauradores⇄ L. Sintra: Rossio |
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Green Line→ Rossio |
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12th branch(closed 1998) |
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× Green Line |
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02,025 |
Baixa-Chiado⇄ Green Line |
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Elev. Município |
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ventilation shaft |
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branch line→ '''Blue Line''' |
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× Tram (R. V. Cordón) |
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× Tram (R. Arsenal) |
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Green Line→ Cais do Sodré |
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ventilation shaft |
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× Tagus |
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Terreiro do Paço |
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Alfândega(pj. 1993; canc.) |
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00,000 |
Santa Apolónia⇄ L. Norte: Santa Apolónia |
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| Topographic map |
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The Blue Line (Portuguese: Linha Azul) or Seagull Line (Portuguese: Linha da Gaivota) is one of the four lines of Lisbon Metro. It is the only line of the Lisbon Metro that is entirely underground.