Usually came with either three or four RED canisters labeled, "LIONEL AIR ACTIVATED CONTAINER / CAPY 20000 / Lt Wt. 4400 / 61125". The last number is an abbreviation of the actual part number 6112-25 which was available for separate sale. There are four variations:
Variation A: BLACK plastic body with WHITE lettering, four RED canisters, and bar-end trucks with magnetic couplers. Listed as "6112-50" in the Service Manual. Available in 1956.
Variation B: BLUE plastic body that usually came with early AAR trucks and three or four WHITE canisters. Produced in 1957.
Variation C: BLACK plastic body with WHITE lettering. This variation came with three or four RED canisters, early AAR trucks equipped with disc couplers and is listed in the Service Manual as "6112". Produced in 1957.
Variation D: WHITE plastic body with BLACK lettering that has early AAR trucks and three or four RED canisters. This is the most difficult variation to find. Produced in 1958.