Thursday, January 26, 2012

Replacing a railroad bridge

4 comments:

Anonymous said...

At about 3:10 they fill in the dirt on the sides of the new bridge. The fill appears to be large black boxes. What are they made of? Are they hollow?

ambisinistral said...

I noticed that too, but I don't know what they are. I don't imagine that they're hollow, because they have to carry the wright of the train coming off of the bridge. Maybe they're put in to keep the earth from settling?

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