Railway crossing modelling

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How do I model something like a rail station?

I don't need to make something super accurate or usable in actually building the railway?

I have some idea about how to position the rails and platforms at a terminus of a metro line such that it would allow for easy transfer between the metro lines, and I want to make a crude 3D model to demonstrate this.

Do I need to learn AutoCAD Civil 3D to do this?