TiG (rail) - that must have hurt

What happens when a boiler explodes ... this is why, these days, there are two safety valves, water gauge glasses, fusible plugs and so on.
Plus loads of rules, tests and training on safely operating pressure vessels.
[No idea when or where this incident took place, and therefore no knowledge of the fate of the footplate crew. It looks like standard gauge and the track is flat-bottom with dog-leg spikes not pandrol style clips].

Not my image ; Fair Use & educational purposes.