Other
- A Citizen 1 results
- A Stockholder 1 results
- A member of the bar, pseud 1 results
- Acworth, William Mitchell, Sir 1 results
- Adams, Charles Francis, 1835-1915 2 results
- Adams, Henry, 1838-1918 1 results
- Adler, Dorothy R. 1 results
- Aiken, S. C. (Samuel Clark), 1790-1879 1 results
- Alberdi, Juan Bautista, 1810-1884 1 results
- Albertype Co 1 results
- Albrecht, Harry P. 2 results
- Albright, George Leslie, 1893-1916 1 results
- Alexander, Edwin P. 1 results
- Alleghany Railroad and Coal Co 1 results
- Alleghany Railroad and Coal Company 1 results
- Allegheny Portage Railroad Company 3 results
- Allegheny Valley Railroad Company 1 results
- Allegheny Valley Railway Company 1 results
- Allen, Horatio, 1802-1890 1 results
- Allen, John E. 2 results
- Allen, Lane & Scott 1 results
- America's Industrial Heritage Project 2 results
- American Hotel Association 1 results
- American Hotel Association of the United States and Canada 1 results
- American Philosophical Society 1 results
- American Railway Master Mechanics Association Convention 1 results
- American Society of Civil Engineers 1 results
- American Society of Civil Engineers Special Committee on rail sections 1 results
- American Society of Mechanical Engineers 1 results
- Amstutz, Marley E. 1 results
- Amtrak National Railroad Passenger Corporation 1 results
- Anderson, Harman 2 results
- Andrews, Clinton T. 1 results
- Applegate, Howard L. 1 results
- Archer, Robert F. 1 results
- Arnesen, Eric 1 results
- Arnold, Andrew Bernard 2 results
- Ashbridge, Thomas 1 results
- Ashcroft, John, comp 1 results
- Associated Railroads of Pennsylvania and New Jersey 1 results
- Association of American Railroads 13 results
- Association of American Railroads (Washington, D.C.) 1 results
- Association of American Railroads. Bureau of Railway Economics 4 results
- Association of American Railroads. Bureau of Railway Economics. Library 1 results
- Association of American Railroads. Railroad Committee for the Study of Transportation 5 results
- Atkinson, Edward, 1827-1905 1 results
- Atkinson, Samuel Coate 1 results
- Atlantic and Great Western Railway Co 1 results
- Atlantic and Great Western Railway Company 1 results
- Atlas Portland Cement Co. (New York) 1 results more…