This is Bachmann 28605 On30 Painted & Unlettered 28-Ton Two-Truck Climax w/Sound & DCC. Bachmann Trains sounds off with an extensive line of DCC Sound-equipped Spectrum locomotives equipped with Tsunami sound technology. Using sounds taken from real locomotives, modelers can add a new level of realism to their railroads with a broad palette of prototypical sound effects and DCC functions. Plus, the dual mode decoders work on both DC and DCC layouts automatically. So break the silence on your railroad with our Spectrum DCC Sound On Board locomotives. Decoder features includes authentic sound effects uniquely appropriate to each model including whistles, bells, chuffs, and air pumps, additional sounds include dynamo, injectors, coupler clank, water stop and more three whistles to choose from in each model whistle can be played in real time to create authentic whistle signals, high quality 16-bit digital sound, advanced motor control features including Load Compensation and Silent Drive to provide smooth, quiet operation supports all recognized programming methods. PLEASE NOTE: THIS MODEL HAS O SCALE DIMENSIONS BUT RUNS ON HO GAUGE TRACK.