...and there's an interesting point. Train driver recruitment and hiring is a highly regulated business. Train operators do not sell "spare training capacity" to the highest bidder as a source of revenue or to "keep trainers busy"
. Most importantly of all they never train more candidates than what is needed to service the industry. Maybe that's because they realise that enlarging the pool of qualified and suitable train drivers increases competition for the same jobs. Something to aspire to for the current generation of pilots.