Table: railway_stats
Columns: rank
railway_station
annual_entry_exit_millions_2011_12
annual_interchanges_millions_2011_12
total_passengers_millions_2011_12
location
main_services
number_of_platforms

Question: What is the main service for the station with 14.849 million passengers 2011-12? 
SQL: SELECT "main_services" FROM railway_stats WHERE "total_passengers_millions_2011_12" = '14.849'

Question: What is the lowest rank of Gatwick Airport? 
SQL: SELECT MIN("rank") FROM railway_stats WHERE "railway_station" = 'Gatwick Airport'

Question: Which location has 103.534 million passengers in 2011-12? 
SQL: SELECT "location" FROM railway_stats WHERE "total_passengers_millions_2011_12" = '103.534'

Question: How many annual interchanges in the millions occurred in 2011-12 when the number of annual entry/exits was 36.609 million? 
SQL: SELECT "annual_interchanges_millions_2011_12" FROM railway_stats WHERE "annual_entry_exit_millions_2011_12" = '36.609'