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

### Instruction:
Which power output had a Build date of 1951–1956?

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

### Response:
SELECT Power output FROM table WHERE Build date = 1951–1956