spritelayout concrete_platform_layout {
  ground { sprite: GROUNDSPRITE_TRACK; index: [0, -1] }
  building {
    sprite: platform_set;
    index: [0, 1]
    yextent: 4;
  }
  childsprite {
    sprite: cargo_set;
    // index: 0; // default
    xoffset: [32, 16];
    yoffset: -16;
  }
  building {
    sprite: platform_set(2);
    index: [2, 3]
    yoffset: 12; // if only one value is specified than x/yoffset and x/yextent are swapped automatically for "building" entries
    yextent: 4;
  }
}