Slugs

Self-propelled Road Slugs<br /><br />They're both underpowered if you try to use them on their own, but they become useful when connected to another locomotive with excess electrical energy.<br /><br />The two-toned one is my best attempt to recreate the locos from a Rock Raiders train set I made in an earlier version of LDD. I think it was in 1.6.<br /><br />Oh, and they are both somewhat intelligent robots.