Radio Shack Block?

A while ago I heard that Radio Shack has a blocking device that would work for switching power between DC & DCC. I can not remember the name, so could someone tell me the name of it?

Double pole double throw switch. (DPDT)

Thanks.

Does Radio Shack make one for wives that tell you that you spend too much money on model railroading?..lol

Sure. They’ve got these noise-cancelling headphones:

Did it ever occur to you to let her share your hobby?