Very simple Factorio mod that adds a keyboard shortcut to toggle the mode (automatic or manual) of the train the player is riding.
To use, simply press 'j' (by default, configurable in settings) while inside a train locomotive or carriage, and the mode will be flipped (i.e., automatic trains will switch to manual, manual trains will be switched to automatic).
The FARL and Honk mods have similar functionality included with their other functions.