adding specific layers in a blank style

Hi I am new in mapbox and have maybe a stupid question.

I started a style from blank and I can`t add some specific layers, which are in other styles in the folder road.
For example I can’t find the layer road-rail in the blank style. I think it should be in Streets v8. But there is just a layer “road”, which can not be subdivided.
How can I find or import the layer? Or can I import it from a different style?

Thanks for Helping.