> When have we seen anything like this?

The US canal and railroad boom in the 1800s definitely had exactly the same thing happening, just compared to our scale today where everything is "more" and "bigger", it looks comparatively small. But in their world, back then, it was basically the same thing, just with canals and railroads. Indiana almost financially ruined itself because of their "infrastructure program". The government got involved heavily with the "1862 Pacific Railway Act" as well.

And yes, easy to say now that "Duh, that's essentially infrastructure" but at the time, that wasn't as obvious to everyone, as and railroad were newfangled technology, especially deployed like that, on a scale never seen before.