In the Class T, what is the total of the 1958 UTA?
CREATE TABLE "great_northern_railway" (
  "class" text,
  "type" text,
  "fleet_numbers" text,
  "quantity_made" real,
  "manufacturer" text,
  "date_made" text,
  "1958_ci" real,
  "1958_uta" real,
  "date_withdrawn" text
);
SELECT COUNT("1958_uta") FROM "great_northern_railway" WHERE "class"='t';