Table:
text: Saltwood Miniature Railway
Locomotives
Locomotives
Number_ Locomotive_type Wheel_arrangement Builder Entered_Service Withdrawn
1 Steam 0-4-2 Tank Jubb Engineering 1922 1928
471 Steam 4-4-2 Atlantic F & A Schwab 1928 1970
260 Steam 2-6-0 Mogul F & A Schwab & Henry Greenly 1939 1975
5060 Battery Electric Bo`2` Tom Smith 1974 1987
7007 Battery Electric Bo`2` Tom Smith 1976 1987

Question: When was the train built by Tom Smith with a number below 7007 put into service on the Saltwood Miniature Railway?