A quick fix would be to disable any train stop where a train is present with circuit networking.
There's no combinator needed. Just hook your train stop to a single power pole with a green or red wire, then set your train stop with the following circuit settings:

-Enable/disable
-Read stopped ...

Have a problem with the trains when it comes to the depot. Its the only thing I can't figure out how to stop....Screenshot included. Trains, after completing delivery.....tend to try to go to stations that already have trains....I have 76 depots and 58 trains. This blocks rails and screws stuff up ...