How many trains call at Castor, Overton, Peterborough East and are operated by LNWR?
CREATE TABLE table_12221135_3 (arrival VARCHAR, operator VARCHAR, calling_at VARCHAR)
SELECT COUNT(arrival) FROM table_12221135_3 WHERE operator = "LNWR" AND calling_at = "Castor, Overton, Peterborough East"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_12221135_3 (arrival VARCHAR, operator VARCHAR, calling_at VARCHAR) Question: How many trains call at Castor, Overton, Peterborough East and are operated by LNWR? [/INST] SELECT COUNT(arrival) FROM table_12221135_3 WHERE operator = "LNWR" AND calling_at = "Castor, Overton, Peterborough East" </s>