@Jack118711 posted:
For what it's worth, that is NOT "white" paint. The UP began painting the journal covers Bright Aluminum, sometime in the early 1950s (some folks refer to it as 'silver paint'). The thought was to show potential lubrication fluid leaks, which would quickly & easily show on the Bright Aluminum paint. Also, the center hub of the engine truck wheels were also painted Bright Aluminum, in oder to match. All the UP 4-8-4s, 4-6-6-4s, and 4-8-8-4s received such treatment.
Another note, the numbering and lettering on UP steam locomotives is also NOT "white"!