The pipes on either side of the engine are comparatively thin and easily deformed, so they're fired separately during the first firing, and then are set in place for the second firing.
由於安裝在車頭兩側的空氣管比較細，容易變形，所以第一次窯燒時先單獨燒，第二次窯燒時再配置上去一起燒。