Producerfrom 1952 to 1960 this Lionel TW model 175W transformer is in verygood condition. This transformer is unique among all of those that Lionel made during the Post War period because it has an independent power source for the constant voltage accessory circuits that is completely separate from the main coil. This is the “B” variation. When plugged in it lights up so I assume it is still in working condition. The box is also in very good condition. .Good luck and !