Hornby 0 Gauge EM320 0-4-0 GWR Tank loco Green No.6600, 3-rail Electric – unboxed

Hornby 0 Gauge EM320 0-4-0 GWR green Tank loco Green No.6600, 3-rail Electric – unboxed.  From the pre-war range of electric M3 locos is this EM3/20 GWR Tank loco in 20 volt electric. I have tested the loco and it runs fine but please note I have not serviced the mechanism it is being sold as is.