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

### Instruction:
Which railway had the earliest build date and a disposal of "Scrapped 1941?"

### Inputs:
table_name: table, columns: ['Railway', 'Loco name', 'Build date', 'Wheels', 'Disposal']

### Response:
SELECT MIN Build date FROM table WHERE Disposal = scrapped 1941