Train Route Information Needed

Hi all,

I am working on a personal project for which I need train transit information (not realtime) from Germany and France.

Given two stations A and B, I need a list of routes available along with intermediate stations. Time estimate is not needed.

I see that, all the information needed is already a part of OpenStreetMap. Is there any way to extract this train transit information? Ideally, I am looking for a REST interface. But practically, I am ok with some data extraction as well.

Can any experts guide how should I proceed?

Thanks