item(booster_wagon ...)
    {
    }
     
    // return power, as computed in TEMP(0)
    switch (..., power_final, [ LOAD_TEMP(0) ] ) {
      return
    }
     
    // check vehicle at position 1 from front, and add 400 if booster
    switch (..., power_check_1, [
    STORE_TEMP(2, 0x10F),
    STORE_TEMP(LOAD_TEMP(0) + (var[0x61, 0, 0xFFFF, 0xC6] == booster_wagon ? 400 : 0), 0)
    ] {
      default: power_final
    }
     
    // check vehicle at position 1 from back, and add 400 if booster
    switch (..., power_check_2, [
    STORE_TEMP(position_in_consist_from_end - 1, 0x10F),
    STORE_TEMP(LOAD_TEMP(0) + (var[0x61, 0, 0xFFFF, 0xC6] == booster_wagon ? 400 : 0), 0)
    ] {
      default: power_check_1
    }
     
    // check vehicle at position 2 from front, and add 100 if booster
    switch (..., power_check_3, [
    STORE_TEMP(2, 0x10F),
    STORE_TEMP(LOAD_TEMP(0) + (var[0x61, 0, 0xFFFF, 0xC6] == booster_wagon ? 100 : 0), 0)
    ] {
      default: power_check_2
    }
     
    // check vehicle at position 2 from back, and add 100 if booster
    switch (..., power_check_4, [
    STORE_TEMP(position_in_consist_from_end - 2, 0x10F),
    STORE_TEMP(LOAD_TEMP(0) + (var[0x61, 0, 0xFFFF, 0xC6] == booster_wagon ? 100 : 0), 0)
    ] {
      default: power_check_3
    }
     
    // basic power is 2000 + 200 per booster vehicle
    switch (..., power_switch, [
    STORE_TEMP(2000 + count_veh_id(booster_wagon) * 200, 0),
    train_length
    ])
    {
     1..2: power_final; // no wagons, no bonus
     3: power_check_1; // one wagon
     4: power_check_2; // two wagons
     5: power_check_3; // three wagons
     default: power_check_4; // four or more wagons
    }
     
    item(engine ...)
    {
    power: power_switch;
    }