This is just what you need to be able to operate your whistle or activate direction control with your transformer that does not have whistle or direction button.
The 167 was first used with early transformers such as the Type V and Type Z-- both of whoch ahd lots of power and voltage, as well as four controls, but no control for whistle or direction.
Made of Bakelite and in that awesome early deco design.
CONDITION: C-6+. Looks good. Tested and working.Complete. Has a deep scratch on one side, pictured for you. Will include a COPY of the original instructions.