. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . striking examples of the4-4-0 type in England were those of the County classon the Great Western Railway. These engines wereequipped with piston valves as built, and, hence, have notrecjuired modernization in that respect. Some of themhave undergone various changes, however, and all arenow fitted with superheaters. The main rods of theseengines have a very neat design of big end. The boilerhas one straight ring immediately back of sinokebox, therest of the barrel being tapered. The cylinders
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . striking examples of the4-4-0 type in England were those of the County classon the Great Western Railway. These engines wereequipped with piston valves as built, and, hence, have notrecjuired modernization in that respect. Some of themhave undergone various changes, however, and all arenow fitted with superheaters. The main rods of theseengines have a very neat design of big end. The boilerhas one straight ring immediately back of sinokebox, therest of the barrel being tapered. The cylinders are 18 x30 inches, drivers 80 inches, working pressure 200 tractive effort lbs. The first of these enginesappeared in 1904, and there are now 40 of them. Asmight be expected, the fast trains of today are much tooheavy for them, and they have been relegated to lessstrenuous duties. These they perform with entire satis-faction. The Pennsylvania Railroad, ever alert in the field ofimprovement, has modernized a number of old 4-4-0 en-gines which are now known as Class D16sb. The iiriii-. Type Locomotive of the Great Western Railway of England cipal particulars of these engines are as follows: Cylin-ders 20J x 26 inches, drivers 68 inches, steam pressure175 lbs., weight of engine exclusive of tender 141,100 lbs.,and tractive force lbs. Originally, these engineshad slide valves and used saturated steam. Some of themhad 80 inch drivers. It will be seen that, though carry-ing less steam pressure, these engines have greater trac-tive force than the County class of the G. W. R. Thisis due to the difference in driving wheel diameter, ratherthan to the variation of cylinder proportions. (There areno more 80 inch 4-4-0 engines on the P. R. R., accordingto available data.) That the modernization of 4-4-0 engines is not so com-mon in .America as in England is clear enough, however,this circumstance being due to a number of factors whichmav be worthy of examination.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
