This pattern with this marking is pictured on page 34 of "Silver At Your Service". Piece is being sold as-is, so take a good look at the photos.
Rhododendron pattern individual creamer Greenbrier Hotel / C&O Railroad
A&WP Railroad China Individual Creamer in the Montgomery Style Pattern
Amtrak Railroad National Pattern 5" Individual Teapot/Coffee Pot By Hall China
Lewis & Clark Explorer Train MENU * Portland Astoria * P&W RR Genessee & Wyoming
3V-24V DC Power Distribution Module Connector 10 Channels with Individual Toggle
