I played the original version of A-Train many years ago, but didn't think it had changed enough to merit the £25 price tag. However, I did buy it in the sale and I am enjoying the nostalgia and the improvements to the graphics and interface. To be honest, I think it is probably even worth the full price to be able to play it on a modern PC.
If you don't know the game, it is perhaps best described as a city builder ... but with a twist! You build the city by building and operating a railway. The railway both attracts people to the area and delivers the construction materials required for them to build with. You can place your own buildings, once you have the construction materials in place, but they will be on the loss side of the balance sheet unless your railways attract enough people to make them profitable before you go broke.
While the game is fun, it can also be frustrating until you get the hang of it. The game guide teaches you the mechanics of play, but leaves you to sort out your own stratigies. Build underground, overground or elevated ? What is the best station to use here ? Which is the best train for the route, in terms of speed and passenger capacity and what is the best schedule for it ? .. a lot of people travel to work in the morning and home at night.
The learning curve is steep and it can be frustrating when you start out. The game comes with 10 scenarios, but there is a map construction option as well. So a good way to learn is to set up a few simple sandbox games to play around with. Also, think ahead and save often, things don't always work out the way you intended them to :)