1. Operating revenues and operating expenses of class 1 railroads in United States (switching and terminal companies not included). Bookmark SuDoc number: IC 1 ste.19/3:(date)
2. Operating revenues and operating expenses of class 1 railroads in United States, compiled from reports of revenues and expenses representing 75 class 1 railroads (switching and terminal companies not included). Bookmark SuDoc number: IC 1 ste.19/3:(date)
3. Operating revenues and operating expenses of class 1 railroads in United States, compiled from reports of revenues and expenses representing 75 class 1 railroads (switching and terminal companies not included.) Bookmark SuDoc number: IC 1 ste.19/3:(date)