And that is the deal breaker. Five or ten minutes in a shop is fine. Hours on a train is not, especially when, despite the reassurances from any company, it is clear that social distancing cannot work even at your seat. And if there is any doubt you don't book rather than book and take a chance. Same applies for air travel. Some will be more relaxed about it I am sure. It's a really tricky time and if, as a company. you cannot be certain of filling your train to whatever your new limit is, then you don't run it.