Athearn RTR 87238 HO Scale 2-6-0 Steam Locomotive Santa Fe ATSF 504 XO-1 Once the axle carriers begin

Once the axle carriers begin to wear at those balls

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The model is based upon the gear-driven 4WD GF-01FT chassis featuring a monocoque frame with power provided by the centrally-positioned motor via front/rear differential gears

Full fuel tank skirts

Athearn RTR 87238 HO Scale 2-6-0 Steam Locomotive Santa Fe ATSF 504 XO-1 Once the axle carriers beginAthearn RTR 87238 HO Scale 2 6 0 Steam Locomotive Santa Fe ATSF 504 Under the Whyte notation for the classification of steam locomotives, 2 6 0 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels. This arrangement is commonly called a Mogul. The 2 6 0 was a modification of the common 4 4 0 design of the 1860s, and served alongside