A lot of dead P.Way men would suggest otherwise, steam locos ran over plenty of them. Not only were diesels even harder to see and hear coming because they simply had less visual and audible presence than a steam loco, the whole railway was getting faster. Faster passenger trains, more 40/50/60mph fitted freight, less 25mph unfitted freight. These days it's been a bad year if trackworker fatalities are in single figures - the last time I looked this up (and of course I can't find the link now), the annual death toll in the 1950s and 60s was frequently over a hundred. Something had to be done.