What Do I Have Here?

It reminds of a lumber loader I used to have.  I believe the logs would roll out the bottom and then drop.

It looks like you may have transposed the sides.

That's a manual log loader from the "Workin' on the Railroad" sets of the late 70's, I believe.  (origins could have been Marx, I suppose - I don't know the history to say it's not).  I do recall there being PC stickers, but those do look larger than what I remember coming with the set.

Might have been in other sets too.

The slot in the back wall had a small manual lever with a curved "catch" that would hold a log you slide in from the side (one at a time) until you released it by gently pushing the lever down.  That piece seems to not be present in your pile. I think you may be missing some other pieces, possibly the platform where the logs slide into the square opening in the side, as shown on the set box (see link below).

I forget exactly how the other pieces go together, but the piece with the "prongs" is I'm pretty sure mounted at an angle in some way near the long rectangular opening so the logs would roll out along the 3 extended prongs into a waiting log car (which was also manual - you would "rock" the part the logs rest in to dump to the side of the track).  The squarish piece with the "X" cross pieces that sits on your table at an angle (nearest your oven door in the 3rd photo) is the "tray" you would dump the logs into from the car.

If it was in front of me, the six year old that still lives inside of my consciousness somewhere might remember exactly how to assemble it, but I'm not typing my thoughts very well!

Here is a link including a picture of the set box for the one I had in  ~1978.

-Dave

Looking more closely, I think you may have all pieces except the "release" lever.

I do think you have the front and back assembled backwards though.  The square hole on the left side should be a high point inside, and the "prong" part would then slope downward towards the long rectangular opening, thereby having gravity help the logs down into the waiting car.

The extra rectangular piece with all the slatted boards is the platform that mounts to the left side of the structure.  The extra piece that looks like legs has the 3 square-ish pegs from the timbers on the top edge.  They mate to the 3 same spaced holes on the underside of the platform.  The other end of the platform then has the "tab" to mate with the left side of the main building.

Combined with the pic of the stand alone unit Phrankenstign posted, you should be able to complete the assembly (less the "lever", assuming you don't have that somewhere else in the collection of "stuff" ).

-Dave

I don't remember the stickers coming with the separate sale Lumber Loader.  Since the color matches the "Workin' on the Railroad" set picture, it appears that's where yours probably originated.  Perhaps the stickers came with it when issued that way.

After a quick search, I found a number of pictures of the entire set.  Here is one that shows the engine, tender, and stickers included in the set:

It appears the PENN CENTRAL stickers included in the set were actually intended for the box car---not the lumber loader.

A LIONEL accessory from a starter set....MPC era.......THANK YOU!

Peter