I see no problem at all in referring to signalmen, firemen, binmen etc. Especially when the vast majority of (for example) firemen are men (93% in 2020) and there is no reason to suggest that this should change.
There’s nothing wrong with accepting the reality that some roles are better suited to certain types of people, ie than men are generally stronger, generally more interested and generally more suited to physical, dirty jobs than women.
Changing such titles, just because a tiny minority of small-minded lefties on Twitter take ‘offence’ (who cares if they do) is pathetic. The important thing is to ensure that the best people are recruited to the right job, based solely on their merits alone (rather than quota filling), even if the result is gender imbalance.