My friend told me that the tracks on The El in Chicago are not actually bolted into the ground, but are just lying there. Apparently, this requires constant maintenance because the tracks move and become misaligned. He said the tracks are not bolted because the ground would shift if they were.
My first question is whether this is true, and my follow-up question is: if it is true, then why is it done this way - the ground shifting doesn't seem to explain much.
2006-11-11
15:43:27
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1 answers
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asked by
Thegrip
2
in
Cars & Transportation
➔ Maintenance & Repairs