Installation is for a HO-Scale Proto 2000 GP9 II generously done by our friends from DCC Xpress installations. They offer high quality WOWSound installations for a flat rate complete with free return shipping! You can find them at:

This features a TCS WOW121 Diesel decoder, AS-MB2 motherboard, KA4 with Keep Alive®, UNIV-SH1-C Enclosure and 35mm x 16mm WOWSound speaker

HO-Scale Proto 2000 GP9 II shown prior to installation.

Shown with the shell off.

Shown with the installation complete.