Hopper Wagon

7 m four-wheel steel hopper wagon for ballast and stone: sloping hopper sides on a riveted frame, bottom discharge doors on a doors knob (shut to open), a load knob of empty or full (heaped ballast; empty shows the bare hopper), end ladders.

风格：low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit