What was the train destination when it has a calling at Boston, Sleaford, Nottingham Victoria?
CREATE TABLE "table1_18365784_3" (
  "departure" text,
  "going_to" text,
  "calling_at" text,
  "arrival" text,
  "operator" text
);
SELECT "going_to" FROM "table1_18365784_3" WHERE "calling_at"='Boston, Sleaford, Nottingham Victoria';