Train Signals [difficulty setting]

Trains without signals feels like already assembled Lego. Its nice but its missing the fun. Some of us train enthusiasts just love designing train networks. I can't descibe how dissapointed I was when I learned there is no signals coming with trains and it stil feels hollow to this day.
Please add optional train signals. They could be set by difficulty settings. This adds layer of realism (acording to common imagination of train networks), extra micro management (like ore sorting), additional puzzle challenge and lots of fun.
For me this can be part of train DLC, everything works.