I was expanding my base using a lot of trains and noticed that placing locomotives/wagons on track is not very funny (with lot of trains).
I know that you can have logistics robots supply with those items, .... but factorio is made for automation, so it would be great to have something like a shipyard (but for trains, I don't know the exact word).
Required items to build this should have processing units (blue), steel, ...., and a 1min build for every locomotive/wagon
An example image:

Thanks