Add realistic sound to your fleet with this wired sound and DCC decoder. Decoder measures: 1-11/16 x 11/16 x 1/4". Speaker sold separately.
 
Use in GP20, GP30, GP35, SD24, SD26, SD35 and more with the following air horns: Wabco A2, E2; Leslie A125, A200, S2M, S3L, S5T; Nathan K3L, M3, M5, P3, P5 (Early); Holden M3H, K5H and Hancock 4700 Air Whistle.