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Om orsaker till rälsbrott (Bana)

av mormorsgruvan, Wednesday, April 05, 2023, 13:10 (761 dagar sedan)

Kyla och hjulslag känner säkert de flesta till.
Statsbaneingenjören juli 1942 skriver. "Vid stålmassans svalning i kokillerna söka sig gaser upp till den övre delen av götet och draga då med sig en del av de i järnet inblandade ämnena, så att en anrikning där uppstår."
Samma tidning skriver att rälsbrott är vanligare vid grusballast än vid makadamballast, på grund av att gruset på vintern fryser.
Antalet rälsbrott vid SJ var 630 år 1917. År 1940 var antalet rälsbrott över 2000.
Antalet vagnar med hjulplattor vid SJ uppgick år 1940 till 1093, men år 1936 endast 106.

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Time: 278
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Time: 1307
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: 1370
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: 5669

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