SELECT id FROM station WHERE local_authority = "Watford" OR "id" = 6 EXCEPT SELECT id FROM train WHERE time = "11:15" AND name != "Ananthapuri Express" OR origin = "Kanniyakumari" AND "train_number" <= 16724 <table_name> : station col : id | network_name | services | local_authority row 1 : 1 | Amersham | Metropolitan line and Chiltern Railways | Chiltern row 2 : 2 | Bushey | London Overground and London Midland | Watford row 3 : 3 | Brentwood | Greater Anglia | Brentwood row 4 : 4 | Broxbourne | Greater Anglia | Broxbourne row 5 : 5 | Carpenders Park | London Overground | Three Rivers row 6 : 6 | Chafford Hundred | c2c | Thurrock row 7 : 7 | Chalfont & Latimer | Metropolitan line and Chiltern Railways | Chiltern row 8 : 8 | Chesham | Metropolitan line | Chiltern row 9 : 9 | Cheshunt | Greater Anglia | Broxbourne row 10 : 10 | Chorleywood | Metropolitan line and Chiltern Railways | Three Rivers row 11 : 11 | Croxley | Metropolitan line | Three Rivers <table_name> : train col : id | train_number | name | origin | destination | time | interval row 1 : 1 | 16724 | Ananthapuri Express | Trivandrum | Chennai | 17:15 | Daily row 2 : 2 | 16127 | Guruvayur Express | Chennai | Guruvayur | 22:10 | Daily row 3 : 3 | 16128 | Guruvayur Express | Guruvayur | Chennai | 4:49 | Daily row 4 : 4 | 16723 | Ananthapuri Express | Chennai | Trivandrum | 11:35 | Daily row 5 : 5 | 16382 | Jayanthi Janatha Express | Kanniyakumari | Mumbai | 06:30 | Daily row 6 : 6 | 16525 | Island Express | Kanniyakumari | Bangalore | 11:15 | Daily row 7 : 7 | 56701 | Madurai Fast Passenger | Quilon | Madurai | 21:49 | Daily row 8 : 8 | 56700 | Quilon Fast Passenger | Madurai | Quilon Junction | 04:55 | Daily row 9 : 9 | 16526 | Island Express | Bangalore | Kanniyakumari | 16:59 | Daily row 10 : 10 | 16381 | Jayanthi Janatha Express | Mumbai | Kanniyakumari | 10:38 | Daily row 11 : 11 | 16650 | Parasuram Express | Nagercoil | Mangalore | 04:20 | Daily
col : id row 1 : 2