The RMT-new Premium tank car series of freight cars are clearly superior in many ways to any previously produced O Gauge cars. The RMT-New cars are now basically a completely re-tooled freight car with top dome loading platform, chassis underbody details showing an airbrake system, operating metal couplers w/hidden uncoupler tab and diecast trucks with fast-roll metal wheels. However, any previous RMT production of only 1 specific Railroad roadnumber will not be repeated (except US NAVY)...allowing each railroad series to continue with multiple roadNUMBERS available. The RMT-New Premium Series cars are true 3-rail O-gauge freight cars They feature: Affordable pricing and great value Different roadnumbers for each RR (except CHRISTMAS JOY, CHRISTMAS NOEL,US NAVY - 1 roadnumber) Realistic painting -lettering - numbers 0-36 suggested minimum radius Diecast metal trucks w/metal wheels - operating metal couplers O-gauge Dimensions approx.10 1/2in.L x 3 5/8in.H x 2 5/16in.W All RMT-New Premium Series freight cars will be available as individual items and not as SETs. However, there will be different roadNUMBERS available for each railroadNAME as shown below or just a single roadNUMBER depending upon specific railroadNAME.