45. Valve for admitting steam to the train-pipes for warming the cars.
46. Valve for reducing the pressure of the steam used for heating cars.
47. Cock which admits steam to the pressure-gauge, 48.
48. Pressure-gauge which indicates the steam-pressure in heater pipes.
49. Pipe for conducting steam to the train to heat the cars.
50. Cock for water-gauge, 51.
51, 51. Glass water-gauge to indicate the height of water in the boiler.
52. Cock for blowing off impurities from the surface of the water in the boiler.
Besides being impressive as a triumph of human ingenuity, there is much about the construction and working of locomotives which is picturesque. A shop where they are constructed or repaired is always of interest. An engine-house (Fig. 35) especially at night, is full of weird suggestions and food for the imagination.
