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 | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| --- | --- | --- | --- | --- | --- | --- |
| S-2 | E1540 | 1940–1950 | 40.0 | B-B | 6-539T | hp (kW) |
| S-3 | E-1530A | 1950–1957 | 163.0 | B-B | 6-539 | hp (kW) |
| S-4 | E-1540A, E-1540B | 1949–1957 | 146.0 | B-B | 6-539T | hp (kW) |
| E-1800 | E-1800 | 1951 | 2.0 | B-B | none | yard slug |
| E-1800 | E-1800a | 1957 | 2.0 | B-2 | none | yard slug |
| S-7 | DL-1000 or ME-1000 | 1957 | 29.0 | B-B | 6-539T | hp (kW) |
| S-10 | DL-066 | 1958 | 13.0 | B-B | 6-539 | hp (kW) |
| S-11 | DL-406 | 1959 | 10.0 | B-B | 6-539 | hp (kW) |
| S-12 | DL-410 | 1958 | 11.0 | B-B | 6-539T | hp (kW) |
| S-13 | DL-411, DL-411A | 1959–1967 | 56.0 | B-B | 6-251C | hp (kW) |
Question:
Name the build date for total produced of 146
Answer:
1949–1957