Check this out… They build the bridge off location, and then move the whole bridge into place.
Very nice. Wish my guys on my RR could work fast like these guys.
Tom
Tom, you just have to increase the time between pictures and they’ll seem to work just as fast. 
Around here they’ve been using big corrugated steel tubes to do that. They replaced 2 bridges nearby that way…
Cool video…
Like Andy says, That’s a cool video, ive seen it before some were.