railway locomotive
         n 1: a wheeled vehicle consisting of a self-propelled engine
               that is used to draw trains along railway tracks [syn:
               {locomotive}, {engine}, {locomotive engine}, {railway
               locomotive}]

English Dictionary: railway locomotive	by the DICT Development Group
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Ruleless \Rule"less\, a.       Destitute of rule; lawless. --Spenser.