I wish I could define it but broadly speaking if it was running on the railway pre 1995 it has a soul, otherwise it doesn't, with certain exceptions both ways
Coincidentally 1995 would have been about the time I got my first i-spy book of trains....
The main thing is for it to be non clinical. To have been designed by engineers rather than marketers. Whatever that means. And to not be too good! It should have quirks and break down occasionally. But equally bits should be over specified and far too good (see e.g. the seat layout on first class mk4 coaches with that delightful kink in the middle that gives a 1 x 1 section).
This applies to other forms of transport e.g. cars. I've posted on here about getting a blisteringly quick tesla, which is excellent for overtaking everyone. Great piece of tech and I don't regret it. But it has no soul. You need a noisy engine for a car to have a soul. Similarly most passenger jets no longer have a soul, they're just variations on the same design. Is the accommodation inside for passengers (at least in J/F class) far better? Absoluetly. But they're boring.
I could go on but surely any transport enthuisast knows what I mean?
The issue you explain has been around for a long time, basically whatever the situation was when the individual was in their youth has changed to being something new.
Talk to older generations and there would be people saying that diesels have no soul, they just rumble on, they don't have the same life as a steam train. Then there would have been those between them and those who love electric trains who would say that electric trains have no soul, how can they when they're so quiet.
Same with other forms of transport, and I wouldn't be surprised if it carried on being something which happens.
It's one area where driverless cars may become unstuck (at least in the short term), in that people like the excitement of driving and so will not want to give that up.
It always amuses me on this sort of thread how many people deny this incredibly basic accounting/economics fact.
Having said that, those who say it won't go on rail also have a point*. So we need to decide what we want to do with the railways otherwise there's not much point.
Personally I'm good with subsidising the basket cases, especially if it's Scottish tax payers doing it rather than me. But I recognise others do not have my love for the railways and tbh perversely the more "modern" they get the less I want to subsidise them. I'm not interested in subsidising a battery multiple unit without a soul when rationally speaking a coach service is better. I want to subsidise nothing later than the sprinter generation, and preferably much earlier. I'm very happy with that.
*It absolutely will go somewhere though and that's the key point being missed. Either lowering the tax burden which is already ridiculous, or paying for other public services/investment. It will not disappear.
The thing with public transport is that it allows more people to get about than if there were only cars available as a form of travel.
By allowing those unable to drive to go places, but also by being able to typically carry more people than cars typically do for a comparable amount of road capacity it reduces the impact of congestion.
A bus carrying just 8 people is typically carrying the same number of people as about 5 cars, yet it's only taking up the road space of 2.
As I've highlighted previously the total cost to run all public transport for free is £1,000 per tax payer (as a comparison the total cost to each tax payer of government spending is £32,000), however the actual extra cost to do so (bearing in mind that public transport already receives government spending) would be much less than that.
That's also before you consider other savings, for example due to people walking a little more being healthier, reduced need for new roads, reduced impact on the economy from road congestion (& road injuries).
However even at £1,000 per tax payer to them have the potential to go by public transport for free could create significant personal savings and savings to business.
However, that £1,000 wouldn't all be from taxes that they would be personally paying (in the same way that the average tax payer isn't personally paying £32,000).