Some TSW2 CSX activities begin with someone in the second seat -- you know: that extra body you have to dodge around as you enter the cab and turn around to close the door or the opposite when switching is afoot? Now and then, driving tasks permitting, I like to gaze leftward and see what the second seat-er is up to and ... huh? ... sometimes there's no one there anymore. The next time I take a peek ... the seat is occupied again. Is there a toilet on this rig? Am I suffering from engineers' fatigue? Please tell me I'm not alone in noticing this oddity.