Need Help to ID this - railroad maybe?

[DryMartini]

OK. These came in a box marked "B-17".
It is steel.
It is nothing we've ever seen. Anyone have any idea?

Tag reads:
General Railway Signal Co.
Rochester, N.Y.
8672101-G1
SER 584217
MFD by Bendix Home Appliances, Inc.
South Bend, IND.

The second one is the mirror of the first, with the number:
8672101-G2

[DryMartini]

From a B-29 expert:

> Hi Bill, what you have there is a pair of ammo booster assemblies for a B-29 gun turret,
> specifically a lower turret. Yours were never fully assembled though, of course! General
> Railway Signal made a lot of turret stuff for the B-29, including complete turret systems
>
>_________________
> ~Trevor McIntyre, "For Mother and Country - a B-29er's War"
> http://www.motherandcountry.com