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

### Instruction:
What is the specification of the locomotives with a total produced more than 19 and a model of fb-1?

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

### Response:
SELECT Specification FROM table WHERE Total produced > 19 AND Model = fb-1