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Old October 7th, 2019, 02:05 PM   #481
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one of the engineers was quoted in a magazine somewhere as saying that they looked at ballasted track and saw that due to the high utilization once renewals started the line would be under a constant renewals cycle, which meant a TSR somewhere all the time, and that this was the reason they opted for slab track.

The exact cause of the higher maintenance requirement wasn't mentioned, but seemingly there was no technical impediment to operating at high speed on ballasted track. But it makes sense there would be waves and that they move relatively slowly compared to the SoS in solid rock / concrete.
"There is no problem so bad that you can't make it worse" - Chris Hadfield

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