Query train block state from rail entity (fetch signals)

[Aidiakapi]

If I have a rail entity, I'd like to be able to query the state of the block.

I'm interested in these properties:

• Amount of trains currently in block (as displayed on the GUI).
• Amount of trains about to enter a block (the ones that have put signals on orange).

My usage is to be able to spawn a train at a section, without having other trains crash into it.