On what date was the number of locomotives 421-6?
CREATE TABLE table_name_70 (date VARCHAR, loco_nos VARCHAR)
SELECT date FROM table_name_70 WHERE loco_nos = "421-6"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_70 (date VARCHAR, loco_nos VARCHAR) Question: On what date was the number of locomotives 421-6? [/INST] SELECT date FROM table_name_70 WHERE loco_nos = "421-6" </s>