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

### Instruction:
When was the motor gear of the LMS 1946 no. 1901 model fitted?

### Inputs:
table_name: table, columns: ['LMS 1932/3 No.', 'LMS 1946 No.', 'BR No.', 'Date built', 'Date motor gear fitted', 'Withdrawn']

### Response:
SELECT Date motor gear fitted FROM table WHERE LMS 1946 No. = 1901