Phillips tank car lettering

Thomas Birkett

Currently on eBay there are models of PSPX 9211 and 9213 (series 9001-9300 blt 1930) lettered in white. Until earlier today there was a PSPX 9311 (series 9301-9325 blt 1936) that is lettered in yellow. Is the lettering color correct on both or either of these series? Maybe the cars in the 9301-9325 series were built by Union Tank Car which started using yellow stenciling before these cars were built and still do.
Tom Birkett
Bartlesville, OK

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