558	MASS TRANSPORTATION - RAIL VEHICLES AND SYSTEMS
55820  *	Freight Carts
55830  *	Locomotives, Diesel
55835  *	Locomotives, Electric
55840  *	Passenger Cars, Light (Self-Propelled)
55845  *	Passenger Cars, Light (Non-Powered)
55850  *	Passenger Cars, Heavy (Self-Propelled)
55855  *	Passenger Cars, Heavy (Non-Powered)
55870  *	Specialized Vehicles (Self-Propelled) (Rail Car Movers, etc.)
55875  *	Specialized Vehicles (Non-Powered)
55885  *	Trolleys, Accessories, and Parts