CREATE TABLE table_51693 ("Locomotive" TEXT, "Type" TEXT, "Builder" TEXT, "Builder's No." TEXT, "Built" FLOAT, "Entered service" FLOAT, "Withdrawn" FLOAT)

What is the Builder of Locomotive 2?
SELECT "Builder" FROM table_51693 WHERE "Locomotive" = '2'
SELECT "Builder" FROM "table_51693" WHERE "Locomotive" = '2'