| Hansen, C. O.; 1949 Blue Book; 1949 | 1949 Blue Book | 1949-00-00 | WABASH | First Assistant |
| Hansen, C. O.; 1955 Red Book; 1955 | 1955 Red Book | 1955-00-00 | ANN ARBOR NO. 5 | Chief Engineer |
| Hansen, C. O.; 1956 Red Book; 1956 | 1956 Red Book | 1956-00-00 | ANN ARBOR NO. 5 | Chief Engineer |
| Hansen, C. O.; 1957 Red Book; 1957 | 1957 Red Book | 1957-00-00 | ANN ARBOR NO. 5 | Chief Engineer |
| Hansen, C. O.; 1958 Red Book; 1958 | 1958 Red Book | 1958-00-00 | ANN ARBOR NO. 5 | Chief Engineer |
| Hansen, C. O.; 1959 Red Book; 1959 | 1959 Red Book | 1959-00-00 | ANN ARBOR NO. 5 | Chief Engineer |