Union Pacific Big Boy Proto 2 Upgrade With BCR !!!! November 28, 2021 / stockyardexpress 20-80001A Premier Big Boy 4-8-8-4 Steam Locomotive Cab #4018. MTH DAP locomotive that is a Proto 2 upgrade complete with a BCR!!! Buy It Now price – $999.95 News Previous post Updated In Stock MTH Premier Diesel Engines Next post Stockyard Express Custom Run Reefers Have Arrived !!!!!