One of the last (hopefully) frontiers I've been looking at for my CGW fleet is the truck journals. I'm not sure about other roads, but the CGW had a mix of several different journals on both of these locomotives.
You can see what comes stock on the Kato F (the Atlas GP30 is the same).

I've identified three other journals from photographs that were used. Two are in this picture on the front truck:

And the GP30:

There's a third journal that looks like just an extended cap over the stock one.
I guess the sloped box ones were from the FT days and couldn't have a speed recorder.
Anyone ever do any research on this?
Jason