Connect your PowerHouse Power Supply directly to the track with the TMCC Direct Lock On. Featuring a select able current setting for the 135-Watt or 180-Watt PowerHouses, the Direct Lock On eliminates the need for a PowerMaster if you run ONLY TMCC or LEGACY equipped locomotives. For added safety, the Direct Lock On provides over-current protection and an automatic reset. It is compatible with both Lionel Fastrack and O/027 track systems. The above as stated on the Lionel box.