| McWilliam, William A.; 1926 Red Book | 1926 Red Book | | DRUMAHOE | Chief Engineer |
| McWilliam, William A.; 1927 Red Book; 1927 | 1927 Red Book | 1927-00-00 | DRUMAHOE | Chief Engineer |
| McWilliam, William A.; 1928 Red Book; 1928 | 1928 Red Book | 1928-00-00 | DRUMAHOE | Chief Engineer |
| McWilliam, William A.; 1929 Red Book; 1929 | 1929 Red Book | 1929-00-00 | DRUMAHOE | Chief Engineer |
| McWilliam, William A.; 1930 Red Book; 1930 | 1930 Red Book | 1930-00-00 | DRUMAHOE | Chief Engineer |
| McWilliam, William A.; 1931 Red Book; 1931 | 1931 Red Book | 1931-00-00 | DRUMAHOE | Chief Engineer |