Where are loco numbers on WP F7 B units?

[ericsp]

Many locomotives in WP's orange and silver scheme had extremely small numbers on the sides. You can see a very small number on the side at the bottom left corner.

http://www.rr-fallenflags.org/wp/wp0913Cgea.jpg 

If I remember correctly, hood units had the tiny numbers on the bottom, rear corner of the cab. 

[lilivalley]

917D had 917D in the number board and on side at the rear, centered in the silver area,with just 917, the Western Pacific is set at the top portion of the silver area this is F7A

[Otis]

I am just lettering some Western Pacific F7 A & B units that are unfinished. I can see from rail pictures sites that many of these cab units have letters only on the number boards, and not on the loco sides at all.

And in these photos I don't see any lettering at all.

www.railpictures.net/viewphoto.php?id=70482&nseq=47

For example, this F7A is 917D and presumably it could be 917 B or 917 C or any of the B units as there doesn't appear to be anything showing.

This is true of photos of these A&B consists from other angles.

Does anyone know where a WP F7B unit might have had any lettering at all?

Thanks.