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| Number | Locomotive type | Wheel arrangement | Builder | Entered Service | Withdrawn |
| --- | --- | --- | --- | --- | --- |
| 1.0 | Steam | 0-4-2 Tank | Jubb Engineering | 1922.0 | 1928.0 |
| 471.0 | Steam | 4-4-2 Atlantic | F & A Schwab | 1928.0 | 1970.0 |
| 260.0 | Steam | 2-6-0 Mogul | F & A Schwab & Henry Greenly | 1939.0 | 1975.0 |
| 5060.0 | Battery Electric | Bo'2' | Tom Smith | 1974.0 | 1987.0 |
| 7007.0 | Battery Electric | Bo'2' | Tom Smith | 1976.0 | 1987.0 |
Question:
When did the tom smith built train enter service with a number under 7007?
Answer:
1974.0