What is the power output for class 5?
CREATE TABLE "current_rolling_stock" (
  "class" text,
  "introduced" text,
  "number_in_class" real,
  "number_in_service" real,
  "power_output_k_w" real
);
SELECT "power_output_k_w" FROM "current_rolling_stock" WHERE "number_in_class"=5;