Well exactly so how can VTEC decide an arbitrary figure? Twenty minutes for a first time rail user or someone who is bringing granny, four kids, a couple of dogs and half their worldly possessions might need twenty minutes. But an experienced solo traveller could easily arrive a few minutes before their train.
It seems far more sensible for for VTEC to simply politely encourage their passengers to arrive with enough time to catch their train. Perhaps with a reminder that train doors may be closed up to two minutes prior to departure.
In theory 20 mins is the check-in deadline at London City Airport too, so they should be careful trying to make the train sound like the plane when elsewhere VTEC like to indicate how there's no need to wait about when getting the train.
https://www.virgintrainseastcoast.c...el/benefits-of-train-travel/train-vs-plane11/
This suggests that 5 minutes from station door to train is enough, but also suggests that you need to allow 90 minutes for a flight!
They need to send a consistent message!
I think the best approach is a message along the lines of:
Advance tickets:
- Remember your ticket is only valid on the specified train so please make sure you arrive at the station with enough time to comfortably catch your train. Remember that doors may close 2 minutes before departure. If you're unfamiliar with the station then we recommend arriving 20 minutes before departure. [1st only] If you have time to spare you are welcome to wait in our first class lounge.
Anytime tickets:
- Your ticket is valid on any of our services from [x] to [y] on the day but you'll only have a reserved seat if you travel on your booked service. Remember that doors may close up to 2 minutes before departure. If you arrive at the station early you can take an earlier train [1st only] or take advantage of our first class lounge.
Off-peak tickets:
- Your ticket is valid on other services from [x] to [y] on the day but you'll only have a reserved seat on your booked service. [weekdays]Please note that there's peak time restrictions on these tickets so please check (link) if you want to travel at a different time. [weekends] These tickets are valid on any service on a weekend, but if your ticket is valid on a weekday please note the restrictions (link). [add bit about doors and lounge]