CREATE TABLE table_51960 ("Train No." TEXT, "Train Name" TEXT, "Origin" TEXT, "Destination" TEXT, "Frequency" TEXT)

From where did the train that arrived in the Anand Vihar Terminal originate?
SELECT "Origin" FROM table_51960 WHERE "Destination" = 'anand vihar terminal'
SELECT "Origin" FROM "table_51960" WHERE "Destination" = 'anand vihar terminal'