How much Converted has a Number of 35, and a Withdrawn smaller than 1952?
CREATE TABLE "great_eastern_section" (
  "number" text,
  "previous_number_s" real,
  "previous_class" text,
  "converted" real,
  "withdrawn" real,
  "disposal" text
);
SELECT COUNT("converted") FROM "great_eastern_section" WHERE "number"='35' AND "withdrawn"<1952;