Want to bring your layout to life then you need to consider introducing that human element. Adding a loco crew is possibly the first step, and there are many models in all of the scales. You can get ready to plant models, but my enjoyment comes from painting and styling white metal cast figures.
Once you have your loco crews then it is a matter of time before you start introducing figures on to your station and then you start populating your carriages with passengers. The people can also add ballast to your rolling stock if you choose white metal figures, so they do have added benefits.Model figures