Which Railway has a Location of shildon, and an ObjectNumber of 1975-7022?
CREATE TABLE "electric_locomotives" (
  "railway" text,
  "builder" text,
  "built" real,
  "wheels" text,
  "location" text,
  "object_number" text
);
SELECT "railway" FROM "electric_locomotives" WHERE "location"='shildon' AND "object_number"='1975-7022';