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and how to set this up / use it correct?

brunzenstein wrote:and how to set this up / use it correct?

When you connect a train station to a circuit network, you can set the checkbox to transmit train ID and decide what signal to use ("T" by default).

If a train arrives to the station, and the relevant checkbox is set, station generates a circuit signal with non-zero value. This value is generated for as long as the train stays on the station. All other time a zero value is generated. You can use this to detect that the train has arrived and what train specifically.

Each train is assigned a unique numeric ID which is always a positive integer. You cannot change train's ID unfortunately, so you have to read the assigned train ID's and work with them.

I'll add that each substantial change of the train (adding or removing a wagon/locomotive) changes this ID; schedule changes are okay though.

The current system of Train-IDs is only a half-baked feature that was introduced in 0.15.11 in order to fix this bug.

I hope that in version 0.16, it will be possible to assign Train-IDs yourself, as has been suggested in the following thread:

viewtopic.php?f=6&t=46969 Constant Combinator for Locomotive