Why were railways a bubble?

1the puzzle

Here's a strange pairing: Britain in the 1840s went mad for railways, and the craze behaved exactly like a bubble. Watch how a good idea turns into a mania.

2real spark

Step one: the idea is genuinely good. Trains cut a journey from days to hours, so early investors in the first lines made real money. That is the spark.

3price climbs

Step two: everyone notices the profits. Share prices climb, newspapers cheer, and people buy not because of the timetable, but because the price is rising.

4the climb

Here is the bubble itself. Prices race upward, far above what the lines could ever earn. By 1846 Parliament had approved hundreds of schemes, many with no route worth building.

5the pop

Then comes the pop. Calls for more cash arrive, investors can't pay, and prices crash. Fortunes vanished. Yet here's the twist: the tracks stayed.

6whole idea

So the lesson in one picture: the technology was real, the price ran ahead of it, and when it popped, investors lost while the country kept its railways.