Edison found time for his new studies by letting one of his friends look after the newsboy work on the train for part of the trip, reserving to himself the run between Port Huron and Mount Clemens. That he was already well qualified as a beginner is evident from the fact that he had mastered the Morse code of the telegraphic alphabet, and was able to take to the station a neat little set of instruments he had just finished with his own hands at a gun-shop in Detroit. This was probably a unique achievement in itself among railway operators of that day or of later times. The drill of the student involved chiefly the acquisition of the special signals employed in railway work, including the numerals and abbreviations applied to save time. Some of these have passed into the slang of the day, "73" being well known as a telegrapher's expression of compliments or good wishes, while "23" is an accident or death message, and has been given broader popular significance as a general synonym for "hoodoo." All of this came easily to Edison, who had, moreover, as his Herald showed, an unusual familiarity with train movement along that portion of the Grand Trunk road.