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Da multipel på Malmbanan (Järnväg allmänt)

av LasseE, Saturday, December 16, 2023, 08:47 (508 dagar sedan)

Definitivt på 60-talet och även senare, tror jag, gick norrlandstågen med Ma till Boden. Där byttes det alltid till 2 x Da i multipel. Varför då? Var det för att ha marginal för ev. lokfel när man körde genom ofta väglöst land eller fanns det någon annan anledning? Tågen var ofta något kortare norr om Boden men 2 x Da har ju driv på 6 axlar precis som Ma. Kanske Da med koppelstångsdrift har mindre benägenhet att slira i snö. Vad säger expertisen?

Hela tråden:

 

Time: 247
SELECT COUNT(*) FROM mlf2_entries LEFT JOIN mlf2_akismet_rating ON mlf2_akismet_rating.eid = mlf2_entries.id LEFT JOIN mlf2_b8_rating ON mlf2_b8_rating.eid = mlf2_entries.id WHERE pid = 0 AND (mlf2_akismet_rating.spam = 0 AND mlf2_b8_rating.spam = 0) AND category IN (0, 4, 5, 6, 7, 8, 9, 25, 14, 23, 19, 22, 24, 10, 21, 11, 12, 13, 15, 16, 26, 18, 20, 27)

Time: 886
SELECT COUNT(*) FROM mlf2_entries LEFT JOIN mlf2_akismet_rating ON mlf2_akismet_rating.eid = mlf2_entries.id LEFT JOIN mlf2_b8_rating ON mlf2_b8_rating.eid = mlf2_entries.id WHERE (mlf2_akismet_rating.spam = 1 OR mlf2_b8_rating.spam = 1)
Time: 1159
SELECT COUNT(*) FROM mlf2_entries LEFT JOIN mlf2_akismet_rating ON mlf2_akismet_rating.eid = mlf2_entries.id LEFT JOIN mlf2_b8_rating ON mlf2_b8_rating.eid = mlf2_entries.id WHERE category IN (0, 4, 5, 6, 7, 8, 9, 25, 14, 23, 19, 22, 24, 10, 21, 11, 12, 13, 15, 16, 26, 18, 20, 27) AND (mlf2_akismet_rating.spam = 0 AND mlf2_b8_rating.spam = 0)

Total time: 7499

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