Main Reservoirs.

34. Main reservoirs should be of the tube design. These should always be located on the engine and be securely and firmly attached with proper supports, to the underside of the running board or on some other suitable part of the engine.

35. Wood packing, or wood supports on the main reservoirs do not give satisfactory results, as owing to shrinkage, the wood blocks become slack.

36. Main reservoirs for freight engines should not be of less than 40,000 cubic inches capacity.

37. For passenger engines the main reservoir should not be of less than 30,000 cubic inches capacity.

38. Only two connections, the inlet and the outlet, should be made to the main reservoir, and these openings should be separated as far as possible. The discharge opening should be near the top part of the main reservoir so that the water or moisture will not pass into the brake pipes.

39. All air brake main reservoirs should be fitted with drain cocks.