CREATE TABLE table_42755 ("Name" TEXT, "Built" FLOAT, "Tonnage" TEXT, "Yard No." FLOAT, "History" TEXT)

What is the history behind Speedrunner III (SSC3)?
SELECT "History" FROM table_42755 WHERE "Name" = 'speedrunner iii (ssc3)'
SELECT "History" FROM "table_42755" WHERE "Name" = 'speedrunner iii (ssc3)'