CAV-56-ORIG-SOUND Cavalex Models OO Class 56 ESU V5.0 Sound Upgrade Kit with Speaker (As-built lighting unit) - 21 pinSOUND DECODER ONLY, NO LOCOMOTIVES INCLUDED This sound pack is suitable for Cavalex Class 56 locomotives with 'as built' lighting configurations, from introduction in the late 1970s until the mid to late 2010s. This Sound Upgrade is recommend to go in any Cavalex Class 56 in BR, Sectorisation and early privatisation liveries. The DCC Sound upgrade kit will allow any customers that missed out on DCC sound fitted versions to turn their DCC Ready models