I've been wondering for years why only MB's Newstations has a void station tile (bare ground with rail without any platforms, pavement or buildings, just like any railway track). It's (or it should be) the most basic freight station tile in my opinion, it's extremely common IRL as well in freight yards to not have any infrastructure besides quite a lot of tracks. Anyhow it never got included in ISR either and since then several new rail graphics have been made and now we have railtypes, too. MB's Newstations supports none of these unfortunately. Also we have at least 2 new quite substantial freight station sets since then (DWE and CHIPS) but neither of these two included it either.
Yesterday I sent a pm to the authors of these two sets asking whether they'd consider adding it and I got the answer from andythenorth that he considered adding it but the void station tile is not compatible with railtypes specs. He also advised me to ask here why that is so. So yeah, that's the question.

Thanks a lot in advance for the explanations.