[whoopdedo]

It's not so much that they were replaced but that the logistics of delivering an entire house's BOM to a single location didn't make sense. What made it work at the time was the railroads. The lumber would be dropped off at a freight yard to be picked up by a local contractor. (Although the homeowner could have done it themselves if they wanted the actual work was typically hired out to tradesmen.) But as the country shifted to highways, houses were being built in places that weren't accessible by train.

[CalRobert]

For what it's worth, my house was shipped a few thousand KM on two lorries. It was about €8,000 for shipping but a lot of that cost was related to it being in the middle of Covid and needing to use a roll-on-roll-off ferry.

[Daz1]

What's your source on that? Freight yards are plentiful.