There have been many runs of the NR class by Austrains. SDS Models took the Austrains NR model and updated it to include a 21 pin decoder socket. At the same time, room was made in the fuel tank for a speaker.
Installation: First, the body and cab needs to be removed from the walkway. The handrails and details parts are fragile so caution should be applied.
If access to the speaker is required, it is a simple matter of removing two screws from the underside the fuel tank and slipping the fuel tank off from the chassis.
Once the decoder and speaker have been fitted, the fuel tank and body are refitted.