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

### Instruction:
What is the Quantity of Type 2-4-2t?

### Inputs:
table_name: table, columns: ['Class', 'Type', 'Quantity', 'Date', 'LNER Class']

### Response:
SELECT SUM Quantity FROM table WHERE Type = 2-4-2t