bykerlads, he might have been operating a steam hammer, a hammerman in other words. Not a trade but skilled work, one of my g'fathers was a railway hammermen for a time and he had served his time as a bootmaker.
Shocking death, health & safety not much of a priority then, working in clothes contaminated with asbestos or soaked in mineral oil/chemicals. Very high incidence of asbestos related death here on the Clyde, it's still killing women who only washed the family dungarees.
Why do people get bowel cancer nowadays? even people who eat the right things, don't drink/smoke, sadly you'll never know I'm afraid.
Bests,
Skoosh.