Does Anyone Know What This Part Is? And What It Is For?

@Jtrain posted:

The part on top of the locomotive cab roof at the rear in the photo below (the 2 bulges: 1 at the back rear of the cab roof and the other that extends out beyond the edge of the back of the cab roof).  Does anyone know what it is (or what they are)?  I have a Lionel prewar Hudson that has a hole drilled in the cab roof at that location and I am guessing that the previous owner drilled the hole to add the part shown in this HO brass model.  I am wondering what was its function on a real Hudson.

Just my opinion but, I think providing better/close-up photos would be much more helpful, especially if you "pointed" to that which you are asking about.

Fill the hole.  JB Weld is wonderful stuff, but all you need is some glazing putty.  Wipe it on, then quickly wipe the excess off the black paint.  Do that again in an hour, then carefully spot the small dot with black paint.

The value of a 700E goes down with added detail.  Want to super detail a Lionel Hudson, consider starting with the $200 Williams repro.

The answer was provided in the thread that I started about my Lionel 700E Hudson:

https://ogrforum.com/...9#157406524760818109

Apparently, it is a work light fixture designed to light the area between the cab and tender.  It appears in the builder's photo of #5344, which is the prototype locomotive that Lionel modeled.  Tough to see in the photo below, but it is definitely there on the cab roof at the back, extending out, just like in the Overland brass model in the photo above.  I guess Lionel just failed to include it.  I am leaning toward adding that detail part rather than filling and repairing the hole.

Google Search Kohs O Scale Hudson and look at images. It looks like a light fixture to me.

@rdg_fan posted:

Google Search Kohs O Scale Hudson and look at images. It looks like a light fixture to me.

Yes. The Kohs model I saw is a J3a Hudson, but the part is similar.  It is a light fixture: