param[10] = reserve_sprites(1);
replace(param[10]) {
    recolour_sprite_f_bus_c {
        0x88..0x8F: 0x07..0x0E;
        0x60..0x67: 0x07..0x0E;
        0xA2..0xA9: 0x07..0x0E;                          // Basic diesel bus colour remap.
    }
}


switch (FEAT_ROADVEHS, SELF, switch_f1_recolor, (company_colour1)) { // choose special bus sprite by CC
    COLOUR_YELLOW:          PALETTE_USE_DEFAULT;
    COLOUR_ORANGE:          PALETTE_USE_DEFAULT;
    default:                recolour_sprite_f_bus_c;
    }

switch (FEAT_ROADVEHS, SELF, switch_f1_color, (built_during_preview)) { // choose special bus sprite during preview
    0:                      spritegroup_r1_bus_c;
    1:                      spritegroup_r1_bus_a;
    default:                spritegroup_r1_bus_a;
    }

switch (FEAT_ROADVEHS, SELF, switch_f1_bus, (company_colour1)) { // choose special bus sprite by CC
    COLOUR_YELLOW:          spritegroup_r1_bus_h;
    COLOUR_ORANGE:          spritegroup_r1_bus_h;
    default:                switch_f1_color;
    }

switch(FEAT_ROADVEHS, SELF, switch_f1_bus_door, [  // Stack door sprites onto bus
    STORE_TEMP((getbits(extra_callback_info1, 8, 8) < 1 ? CB_FLAG_MORE_SPRITES : 0) | switch_f1_recolor, 0x100),
    getbits(extra_callback_info1, 8, 8)
    ]) {
    0:  switch_f1_bus;
    1:  switch_r1_bus_door;
    }