Rare, but not unheard of. See for example the Hatfield disaster in 2000, or the 2021 Ghotki rail crash. Most railways regularly inspect their tracks to detect

Rare, but not unheard of. See for example the Hatfield disaster in 2000, or the 2021 Ghotki rail crash. Most railways regularly inspect their tracks to detect issues before they turn into a disaster. The big question here will be: why wasn't this caught earlier?