"N--no," answered the watchman hesitatingly, "for I remember Wacker loaned me the old switchman's key the first night. Hold on, though!" cried McCarthy with a spurt of memory, "it comes back to me clear now. The next night he told me to keep the key till the old switchman came back on duty--so he must have had an extra one of his own. They are easily got--it's a common, ordinary lock."