BLI 10603 HO Scale Big Boy 4-8-8-4 UP 4014 250th East Coast Tour 2026 Stealth DC Cap Pack RPM 81502 Black Rear A-Arm

RPM 81502 Black Rear A-Arm for Arrma 3s Granite Senton Big Rock

and the other aerodynamic parts

Resistant to any kind of weathering

H10 Optic Body Panel Set - Includes livery graphic decals (Not installed)

BLI 10603 HO Scale Big Boy 4-8-8-4 UP 4014 250th East Coast Tour 2026 Stealth DC Cap Pack RPM 81502 Black Rear A-ArmBLI 10603 HO Scale Big Boy 4 8 8 4 UP 4014 250th East Coast Tour 2026 Stealth DC When railfans think of big steam, one locomotive almost always comes to mind: the Big Boy. Often regarded as the largest steam locomotive ever builtand certainly a contender for the world's most famous locomotivethe Big Boy was created to meet some of the most demanding operating requirements ever placed on a steam engine. The Union Pacific Railroad needed a locomotive