Inspiration struck, and with nothing else hogging up the MOC-building table, I was able to go for it immediately.  This is going to be a series of vehicles, each with a distinct color scheme and style (hopefully), in the vein of my old "Hero Factory Racers" lineup.  I think the next one will be yellow & orange, we'll see; it'll depend upon what parts jump out at me first.

Video: LEGO Rail Rider Azul - Racing train MOC