Unlike most vehicles and tools in Farming Simulator 19, you don’t need to spend any of your money in the game to unlock the train. It is available from the beginning, and can be accessed using the switch vehicle button, which is D-Pad on controller and Tab on PC. Cycle through all your vehicles and eventually, you will find the train.
Once you are on the train, you can use it to transport goods. However, if you want to fill it with your crops, you need to own one of the railway silos on the map. You can get these by buying the land that they are on.
This is an article about how to get lime farming simulator 19. If you have any questions, ask them in the comments below.