Da Capo Press. 1995: 76–77 [1969]. ISBN 0-306-80652-5. Handling Fast Freight on the Santa Fe. The Railroad Gazette(英语:The Railroad Gazette) (The Railroad
29, 2012]. (原始内容存档于2020-11-07). "The Howard Street Tunnel- Moving the Freight Through Baltimore", Smith, Jeffrey, The National Railway Bulletin, Volume