Quick view Rivarossi Rivarossi 4-8-8-4 Big Boy w/Oil Tender Sound & DCC Union Pacific #4014 HR2884S $549.99 Rivarossi 4-8-8-4 Big Boy w/Oil Tender Sound & DCC Union Pacific #4014 HR2884S. This Hornby Rivarossi 4-8-8-4 Big Boy is a model of the largest steam locomotive in the U.S. It was operated by the... Add to Cart Add to Wish list