Astrotrain loves to sow confusion. To this end, his Triple Changer abilities serve him well. Nothing pleases him more than confronting an Autobot in a dark corner and making him wonder if he's up against one Decepticon or two. He craves having this power over others. Single-minded, you may say, but when most of your time is spent transporting troops around, you have to take your jollies where you can. He wants more from life, but it's either fly the other Decepticons around, or get scrapped by them.
His alt-mode is a Space Shuttle / JNR Class D62 Steam Locomotive