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

### Instruction:
What is the fleet size of the Vanguard 0-6-0dh class?

### Inputs:
table_name: table, columns: ['Class', 'Type', 'Introduced', 'Fleet Size', 'Numbers']

### Response:
SELECT Fleet Size FROM table WHERE Class = vanguard 0-6-0dh