. French railways . sed only for supporting the trailingend of the engine (4-4-2), and in other cases ofthe same diameter as the two pairs of drivingwheels and coupled to them (4-6-0). Though thenumber of designs which are built to at the presenttime is so few, there are of course a large numberof the older engines of the most diverse types stillin service as well as the eight-wheel four-cylindercompound engines with a leading bogie and four-coupled wheels (4-4-0), which were the immediateforerunners of the ten-wheel engines. The pres-sure of the steam in the compound engines is14, 15, or 16 k
. French railways . sed only for supporting the trailingend of the engine (4-4-2), and in other cases ofthe same diameter as the two pairs of drivingwheels and coupled to them (4-6-0). Though thenumber of designs which are built to at the presenttime is so few, there are of course a large numberof the older engines of the most diverse types stillin service as well as the eight-wheel four-cylindercompound engines with a leading bogie and four-coupled wheels (4-4-0), which were the immediateforerunners of the ten-wheel engines. The pres-sure of the steam in the compound engines is14, 15, or 16 kilogrammes per square centimetre(199, 213, and 227 lb. per square inch). 60 FRENCH RAILWAYS The Paris-Orleans railway have lately intro-duced a new type of express engine, which, witha pair of wheels more than the express enginespreviously in use, is considerably bigger than anybefore seen in France. The power of an enginebeing chiefly dependent upon the amount of fuelthat can be burned in a given time, and this, in. 4-4-0 FOUR-CYLINDER COMPOUND EXPRESS EXGI^E (). turn, depending upon the area of the grate, thegrates of these engines have been given an areaof 46 square feet. The arrangement whereby thisis effected is new. The front part of the gratelying between the last pair of coupled wheels hasto be of the ordinary width, but the back part,which is not confined in this way, is made a good FRENCH RAILWAYS 61 deal wider and is spread out above the roof of the firebox being of the same width
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