F-3B Western Pacific (Silver & Orange) WP had no road numbers on units (Equipped with MicroTrains Couplers) (SKU 85-69810)
Please note: Western Pacific did not number their B units, or if they did the numbers were so small it would not appear large enough on the model to see. So intermountain will be making the B unit and customers can buy as many as they want. Matt at IMRC tells me these units were used for the Zepher.
$84.95 US