an auxiliary drive traction system for an automated guideway transit vehicle . remotely controlled hydraulic or electrically powered auxiliary drive systems are used to drive the agt vehicle &# 39 ; s lateral guide wheels , which are biased against a running surface , thus providing an auxiliary drive and braking system . a remotely controlled clutch may be added so as to selectively couple the auxiliary drive system and the guide wheels . a protective skirt is attached to the edges of the guideway assembly along its entire length in order to shield the guide wheel running surfaces from adverse weather conditions .