What is the UK Railway with an ObjectNumber of 1975-7023?
CREATE TABLE "standard_gauge_designs_1870_to_1899" (
  "railway" text,
  "built" real,
  "wheels" text,
  "location" text,
  "object_number" text
);
SELECT "railway" FROM "standard_gauge_designs_1870_to_1899" WHERE "object_number"='1975-7023';