Skye

I may be wrong here, but I think purple was going to be the colour when it was still gonna be called "crossrail"?

There is such a thing as "light rail" though. Lighter tracks, lighter trains, and cheaper construction.

Also if you want small trains, just look at the UK. Normal trains here are much narrower than normal US trains, they are about as wide as modern trams! And the London underground has trains that are tiny and shaped to make the most out of circular tunnels.

You don't need to rethink the entire system for the points you've raised there...

I have a few nitpicks...

Making train tunnels cheaper by making them smaller is not a new idea. it is a very old idea. Have a look at the deep level tube lines of the London underground. In some ways, we regret having trains that small since it reduces capacity and makes it nigh impossible to air condition.

It's possible to make normal trains go over existing roads, elevated rail is also a very old thing, a lot of it did get taken down though.

For some lines that go above ground (Northern, Jubilee, Central), the driver sometimes had to put it into manual mode to compensate for the worse breaking when it's raining outside.

Well in the UK the subjects you select is very closely tied to which University you can go to. Some universities require maths and will not accept people who haven't done it (sometimes even more advanced maths is required).

Some universities don't require maths and so will teach it to everyone who's applied. Some don't require it but force you to take a year of it if you haven't done it. and others require it and reject you if you haven't done it.

In my case, I have two card from one bank has sort code and account number. I also have one card from a different bank has none of that.

In the UK the details needed to transfer money into an account are on most bank cards (Account Number and Sort Code), so that's enough identifying info.

That would also mean someone can send you money if your card is blocked or cancelled. Account number and sort code don't change when you get a new card.

Also, "Faster Payments" is the name of the normal system to transfer money between accounts in the UK. It doesn't cost the sender anything other than the money they send. It's called "faster" because the old system was a lot slower (because it was based on paper I think?).

This font reminds me a lot of "Rail Alphabet" which is a font designed by British Rail in the 60s which was used to railway signs and also in hospitals. Newer fonts are starting to replace it, but there is still a lot of it around if you know where to look.

It seems to be a diesel locomotive pulling passenger carriages (almost certainly ones that were obsolete at the time).

It's still a pretty impressive way to show how strong they are...

This concept is not new at all, From what I understand the tunnel sizes proposed are barely bigger than the London Underground "tube" tunnels. (Glasgow's subway has even smaller tunnels too). Now, don't get me wrong, it worked quite well for London, but it's not exactly innovative.

On old British rail trains, commuter trains had many doors, I think on each side there was a door for each pair of row of seats?

There was also no door lock, so people could start leaving the train before it fully stopped.

The lack of a door lock is also why they're not used anymore.

The trains in the narrow tunnels push air around, so recent stuff like full height platform screen doors help improve conditions (allowing platforms to be air conditioned without having to air condition the tunnels)

IIRC the main heat source is the breaking of the trains combined with the high frequency of them. I suspect that using many cars will still release a lot of heat into the tunnels.