Railway station in Travelcard Zone 3 (in Zone 2 until 2008) opened 1 August 1853 as Acton.
Acton Central railway station is on the London Overground, between South Acton and Willesden Junction, in Travelcard Zone 3. It is also where trains change power supply from overhead line equipment (25 kV AC) to third rail (750 V DC), or vice versa, depending on direction of travel (overhead line is used to Stratford, third rail to Richmond).
More information on the Wikipedia page [1].