I am recently retired and have two grand sons that are nuts about trains.  My father bought me a train just after WW2.  That train is a Lionel O Gage Engine 2025.  My father was very into building train displays and had two trains himself.  One O Gage and a HO Gage train.  

I am now restoring the Lionel O Gage for my son's son and building up the HO Gage for my Daughter's son.