Reply To: my 4-8-8-4 big boy steam locomotive Home › Forums › MOCs › my 4-8-8-4 big boy steam locomotive › Reply To: my 4-8-8-4 big boy steam locomotive December 2, 2014 at 7:09 pm #9330 Benjamin C GoodParticipant This is quite the serious endeavor here. It looks like it’s running on Power Functions? We’ve mostly been using set trains for displays, so an original would be welcome.