Again, coal was shipped eastward from Kuan-yin-t'ang in Honan while the same kind of coal was being shipped westward from the Feng-feng and Chiao-tso mines — a typical instance of cross-hauling. Another example is the shipment of coal for household consumption from Yang-ch'uan in Shansi to Peking where local coal from Men-t'ou-kou was available, even though there may have been some quality difference.