Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Number | Builder | Type | Date | Works number |
| --- | --- | --- | --- | --- |
| 51 | Baldwin Locomotive Works | DS4-4-750 | 1949 | 74408 |
| 52 | Baldwin Locomotive Works | DS4-4-750 | 1949 | 74409 |
| 53 | Baldwin Locomotive Works | DS4-4-1000 | 1949 | 74193 |
| 54 | Baldwin Locomotive Works | S-12 | 1952/1953 | 75823 |
| 55 | Baldwin Locomotive Works | RS-12 | 1955 | 76024 |
| 56 | Baldwin Locomotive Works | RS-12 | 1955 | 76105 |
| 57 | Baldwin Locomotive Works | S-12 | 1953 | 75914 |
| 61 | American Locomotive Works | RS-11 | 1979 | Unknown |
| 62 | American Locomotive Works | RS-11 | 1979 | Unknown |
| 63 | American Locomotive Works | RS-11 | 1979 | Unknown |
| 64 | Electro-Motive Diesel | GP9m | 1987 | Unknown |
| 65 | Electro-Motive Diesel | GP9m | 1987 | Unknown |
| 66 | Electro-Motive Diesel | GP9m | 1956 | Unknown |
| 67 | Electro-Motive Diesel | GP9m | 6/1954 | 19554 |
| M-80 | Mack | Railbus | 1923 | Unknown |
| M-100 | Edwards Rail Car Company | Motor Car | 1925 | Unknown |
| M-200 | SS&IW | Motor Car | 1927 | Unknown |
| M-300 | American Car and Foundry Company | Motor Car | 1935 | Unknown |
Question:
What is Works Number, when Type is RS-11, and when Number is 61?
Answer:
Unknown