The trees hide over half of the 600' (183m) trestle.
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| Street View, Dec 2024 |
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| BNSF Railway 1:00 video (source) @ 0:00 In just 28 hours, BNSF crews safely demolished an 85-year-old wooden trestle bridge and built its 600-foot steel-and-concrete replacement north of Justin, Texas. More than 40 team members worked around the clock to ensure the new structure was ready for service. After months of planning, teamwork and engineering precision, everything came together in a tightly choreographed operation that showcased the pride of railroading. See a lightning-fast timelapse video of 28 hours of work condensed to one minute at https://www.youtube.com/watch?v=HfknlgO4-Pw. [Some comments observed that they had already driven all of the steel piles through the old deck structure and had cut them to length.] |
Here we can see a couple of the new steel-pile bents.
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| @ 0:10 |
The small precast concrete structures to the right of the excavators would be the pier caps. The other structures are half of a span.
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| @ 0:19 |
It looks like they used juice (hydraulic) cranes for the pier caps and lattice cranes for the spans.
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| @ 0:21 |
Here a half-span is being slewed into place.
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| 0:23 |
The length of the bridge is needed to pass the Denton Creek when there are rains.
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| @ 0:36 |
That tamper has his target out, so he is probably close to a final pass.
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| @ 0:47 |
The apparatus hanging out of the rear of the truck is an arc welder. The are welding the joints between track sections. The sections are two rails with their ties that have been preassembled so that they can be pulled into place after the spans have been built.
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| @ 0:49 |
After the welding, they did more tamping. I wonder if they also used a dynamic stabilizer to allow track speed after they were done. And I wonder what the track speed was before and after the replacement. Tracks on stone ballast should support a lot higher speed limit.
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| @ 0:53 |
I guess they did not use a stabilizer because this Amtrak train is creeping over the bridge.
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| @ 0:53 |
About a third of the construction time was dumping ballast and doing tamper passes.
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| 1:00 video @ 0:39 Timelapse of BNSF bridge replacement! 28 hours of work in 1 minute |
There is a parallel route, so detours during the outage would have been rather easy.
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| BNSF via Dennis DeBruler |
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