Bogies
Menu is used to select bogies, to access it hold the button that is used for Focus Schematic Overlay (assigned primary to the left ALT button) while having Train Casing in the main hand.
The menu includes indicators which bogies are compatible with a given track width:
N -> Narrow gauge; S -> Standard gauge; W -> Wide gauge
Red means that selected bogie or bogies in that category are NOT compatible.
Green means that selected bogie or bogies in that category are compatible.
Yellow means that some of the bogies in that category are compatible.