Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23652 ( "LMS 1932/3 No." real, "LMS 1946 No." real, "BR No." real, "Date built" text, "Date motor gear fitted" text, "Withdrawn" text )

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

### Accurate SQL ###

SELECT "Date motor gear fitted" FROM table_23652 WHERE "LMS 1946 No." = '1901'