Price (as of Jan 2018) : FREE to Download
A detailed train simulator freely available. Many routes and trains can be downloaded for free.
Graphics vary from route to route and train to train depending on the route or train downloaded. Some graphics are highly detailed with 3D cockpits. An example of which you can see on the London Underground Routes.
All the sounds you would expect to hear on a train are there, doors opening, engine sounds, screeching of brakes etc. All seem to be accurate and as they sound in real life.
Once you have learnt how to download and install the trains and tracks it is quite straightforward to pick up and learn. The documentation is very good. Some trains can have different controls however so you may need to check any additional documentation that comes with a train you have downloaded. Graphics on some routes can be quite basic , on others can be more detailed. As a train simulator though it is definitely worth looking at, it;s freely available, support is good and there are so many routes and rolling stock to choose from.
Free to download theretofore no costs. Can be a bit confusing at first on how to install routes but plenty of help online and easy once you know.
Below OpenBVE London Underground Route