Many things have changed since the HSTs first entered service nearly 40 years ago.
1. Driving standards have changed, defensive driving and not chasing restrictive signals.
2. More congested railway
3. Safety standards have changed
4. OTMR at al. Speeding was possible without being caught. Now the OTMR tells on all, both good and bad. I think some have said Paddington to Reading used be done in just over 20 minutes, now it looks like just over 25 minutes.
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I'm sure whatever requisite knowledge drivers weren't bestowed with at birth, they obtain during training. I'm sure this is was as true 20 years ago as it is now.
Though sadly whether the training is as thorough now as some claim it once was I do wonder. I would suggest their were instances back in the past were drivers used to just sign the route card and away they went and indeed in parts of the industry it may still go on today - need I remind readers what happened with the DCR driver a year or so back, at Stafford I think, and subsequent RAIB report on that SPAD.