Marx lithographed four wheel freight cars with knuckle couplers including; 174593 New York Central Pacemaker boxcar, 4495 State of Maine boxcar, 559 floodlight car, 28500 Lehigh Valley high-sided gondola, 550 New York Central wrecker crane and a 20102 NYC caboose. Also included is a lithographed 5012 New York Central REA mail car with four wheels and knuckle couplers. The 550 is C5 and the rest of the cars are C6.