Age, gender, ethnicity are all diversity discussions.

If an old guy is better at driving a train than a young guy, you shouldn't give the young guy the job just because he's young.

If you don't need train drivers in the future, which is likely, you shouldn't be training young guys to drive trains, because they will be unemployable once they qualify.

We will need a small number of young train drivers to take over from the old fockers like me, once the boomers above us retire.

I am authorised to speak on this subject having driven an old train 😂