4.—(1) Where OXIDIZING SUBSTANCES are being carried in bulk in metal wagons or large containers, measures shall be taken to prevent those substances from coming into contact with any other combustible dangerous goods or any wooden part of the wagon or container concerned.
(2) Where OXIDIZING SUBSTANCES are being carried in bulk in wooden lined containers or wooden wagons their flooring and sides shall be completely covered with a waterproof and incombustible lining, or with a coating of sodium silicate or a similar product.