I don't recall K-Line making those specific versions of Pacifics, which Lionel just delivered. On other thread I see guys comparing these new versions to the "previously issued" Lionel models, specifically the Southern Rwy PS-4.

K-line as far as I know never made a scale pacific like the Lionel model. K-line did make a beautiful scale Southern Mikado. I do have this engine and they are beautiful. I hope the new Lionel scale Mikado in the new 2012 cat. will be as colorful. It will be a legacy engine like the new pacific crescent. The tooling for the Southrn Crescent is all new tooling, I wish Lionel had used new tooling for the legacy Blue Comet, and the Alton limited engines. All three new engines are great but the Crescent is the only one with the new tooling. The other two are the same tooling used for the Lionel Odyssey engines from a few years ago.

K-line K-3686-4501cc Southern 2-8-2 Engine and tender.

I just went upstairs and looking at mine (the Southern Crescent in the 2012 catalog - it arrived Friday).  From underneath I can see the motor, etc. 

There is a can motor mounted horizontally between the cab and the drivers - shaft runs the along the axis of loco and is parallel to the axis of the loco -- the motor is not mounted at an angle.  It turns a worm gear that is roughly over the center of the rearmost drivers.  The brass flywheel -- 1/2 inch thick roughly, startsabout 1/4-1/2 inch behind worm gear, and the motor directly behind that, with the rear of the motor just ahead of the front wall of the cab.  

Hope this helps.