Union Pacific's 9000 series steam locomotives were unique in that the 4-12-2 wheel arrangement made them the biggest non-articulated steam locomotives. From the Green Frog show "The Golden Twilight of Postwar Steam, Part 3" https://rfd.video/PostwarSteam3 | Steam Giants

C&O 4-8-4 Greenbrier No. 614 is the steam star after a roundhouse fire heavilly damaged Reading T-1 No 2101 in 1979. The locomotive operated on the Chessie Safety Express excursions in the late 1980s. A slow pacing sequence and a slow runby on the Cranberry grade in West Virginia in this clip from the GSVP show "C&O 614 Revival" https://rfd.video/614Revival | Steam Giants

Some Class A locomotives on the N&W. From the Pentrex Show "Steam Across America Combo, The East and The West" https://rfd.video/SteamAmerica | Steam Giants