Dusty, industrial purple, like a generator humming in a factory corner.
Self Powered is a cool purple, close to mauve.
It can be described as cool, muted, greyish and dusty.
Set in black, because black reads best on it.
A multiple-unit train is a self-propelled train or trainset composed of one or more carriages joined, and where one or more of the carriages have the means of propulsion built in. By contrast, a locomotive-hauled train has entirely unpowered carriages.
Read on WikipediaIn philosophy, the self is an individual's own being, knowledge, and values, and the relationship between these attributes.
Read on WikipediaAdjective