[_jzlw]

This is the part that I find insane. What if the bridge had collapsed, and no one had bothered to post a picture of it to social media?

[pmyteh]

I mean, you're supposed to call the police or Network Rail: there are placards on the (remains of the) bridge with the telephone number. But yes, it's not uncommon to have to send a train to examine the line (at slow speed, able to stop within line-of-sight) after extreme weather.