TL;DR
make trains in manual mode look different in the map view.What ?
trains in automatic mode: no differencetrains in manual mode: one option would be to make the normally red outline of trains in map view the color of the character (last user) when they are in manual mode.
Why ?
If you build large completely modular train factories and build an another factory module it will be way harder to forget/overlook activating the newly blueprinted trains in manual mode (when they are finally built). And this would also be useful for the train or train station overview tabs. So you easily see if every factory/train is active. At least that is how I got this idea. Probably also cool for multiplayer.Edit: actually my conclusion now is that there should be an option to turn on that trains in manual mode trigger an alarm like bots when they are missing stuff. also a potential workaround is to give your blueprinted trains a fuel that is not available for your construction bots. and remove the request of it before you change them to automatic.