Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the build date of the locomotives with a total produced less than 45 and a fb-2 model?

### Inputs:
table_name: table, columns: ['Model', 'Specification', 'Build date', 'Total produced', 'Wheel arrangement', 'Prime mover', 'Power output']

### Response:
SELECT Build date FROM table WHERE Total produced < 45 AND Model = fb-2