Name the power output for model of s-13
CREATE TABLE "switchers_s_series" (
  "model" text,
  "specification" text,
  "build_date" text,
  "total_produced" real,
  "wheel_arrangement" text,
  "prime_mover" text,
  "power_output" text
);
SELECT "power_output" FROM "switchers_s_series" WHERE "model"='s-13';