What is the quantity for railway 263?
CREATE TABLE table_name_50 (quantity VARCHAR, railway_number_s_ VARCHAR)
SELECT quantity FROM table_name_50 WHERE railway_number_s_ = "263"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_50 (quantity VARCHAR, railway_number_s_ VARCHAR) Question: What is the quantity for railway 263? [/INST] SELECT quantity FROM table_name_50 WHERE railway_number_s_ = "263" </s>