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:
| Model | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| --- | --- | --- | --- | --- | --- |
| C-424 | 1963–1967 | 92.0 | B-B | 16-251B | hp (kW) |
| M-420 | 1973–1977 | 92.0 | B-B | 12-251C | hp (kW) |
| M-420B | 1975 | 8.0 | B-B | 12-251C | hp (kW) |
| M-420R | 1974–1975 | 5.0 | B-B | 12-251C | hp (kW) |
| M-420TR | 1972 | 2.0 | B-B | 12-251C | hp (kW) |
| M-420TR | 1975 | 15.0 | B-B | 12-251C | hp (kW) |
| M-424 | 1980 | 19.0 | B-B | 16-251B | hp (kW) |
Question:
What is the build date when total produced is 2?
Answer:
1972.0