. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . to move an unusual volume of busi-ness, and while new engines were on order, deliveries weremonths away, and in this emergency the triplets, althoughnot considered of good design, were purchased, as singleexpansion 4-6-2 engines and placed in service handling ukee & St. Paul Railway Illustrations of the triplets at the three periods of theirhistory are here shown: Fig. 1 — Birth of the 4-6-2 or Pacific tyjje, 32 years cross compound, ten wheelers with trailing wheel todistribute weight
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . to move an unusual volume of busi-ness, and while new engines were on order, deliveries weremonths away, and in this emergency the triplets, althoughnot considered of good design, were purchased, as singleexpansion 4-6-2 engines and placed in service handling ukee & St. Paul Railway Illustrations of the triplets at the three periods of theirhistory are here shown: Fig. 1 — Birth of the 4-6-2 or Pacific tyjje, 32 years cross compound, ten wheelers with trailing wheel todistribute weight and make engine easier on track. Fig. 2—Bought by the Plant System in 1900 as singleexpansion 4-6-2 type. Fig. 3—As now in service on .Atlantic Coast Line Rail-way as plain single expansion 10 wheelers. It would appear from the above that the first 4-6-2 en-gines came into existence through placing a trailing wheelunder rear of 4-6-0 or standard 10 wheel engine, in orderto relieve the superstructure or track load and as this lefttlie drivers limited in adhesive weight, the trailers were. ice on Atlantic Coast Line removccance 1 (or rejected ) in order to improve their perform- Depreciation and Average Life .•\s a fundamental principle the depreciation charges,taken up monthly in operating expenses, should cease,when such charges with respect to any equi])ment, plusthe scrap value, equals the ledger value of the property. 168 RAILWAY AND LOCOMOTIVE ENGINEERING June, 1925 The rate or amount of depreciation varies with differentrailway companies from as low as 2 to above 4 per cent,the average being above 3 per cent, on which basis thenormal average life of a steam locomotive would be about30 years depending, of course, largely on the standard ofmaintenance. It does not often happen that in the ordinary span ofbusiness or social life one might ride behind the same loco-motive on two different trunk lines, more than 1,000 miles apart, and with an interim of 32 years, and w
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