Oil Pump O Scale Plug Extend PlayDetails: Based on the "nodding donkey" style pump working oil fields across the country, this new accessory features the smooth bobbing action of the real thing. Add two or three oil pumps to model this common industrial scene. Plug Expand Play Accessory The pump moves up and down Connects easily to FasTrack with a Plug Expand Play Lock on (sold separately) Connects to a traditional O O27 track lock on or to an accessory power supply (lock on and