What was the gross tonnage of the ship that ended service in 1866?
CREATE TABLE "ships_of_the_great_eastern_railway" (
  "ships_name" text,
  "entered_service" text,
  "ended_service" text,
  "gross_tonnage" real,
  "type_of_vessel" text
);
SELECT "gross_tonnage" FROM "ships_of_the_great_eastern_railway" WHERE "ended_service"='1866';