Question: What are the names of the stations which serve both "Ananthapuri Express" and "Guruvayur Express" trains?
SQL: SELECT T2.name FROM train_station AS T1 JOIN station AS T2 ON T1.station_id  =  T2.station_id JOIN train AS T3 ON T3.train_id  =  T1.train_id WHERE T3.Name  =  "Ananthapuri Express" INTERSECT SELECT T2.name FROM train_station AS T1 JOIN station AS T2 ON T1.station_id  =  T2.station_id JOIN train AS T3 ON T3.train_id  =  T1.train_id WHERE T3.Name  =  "Guruvayur Express"