Railway and Locomotive Engineering . er-mine the most suitable boiler design togive maximum power with minimumweight. It was known that some yearsago experiments were made in Francewhich showed conclusively that the bestlength of flue for a given diameter, for as compared with a straight flue sheet. With this data, it seemed desirable tohave a combustion chamber to keep thellue lengths down to proper proportions,a long flameway for gases, as much fire-box and combustion chamber heatingsurface as possible, and the introductionof superheated air to mix with and con-sume unburned gases before the
Railway and Locomotive Engineering . er-mine the most suitable boiler design togive maximum power with minimumweight. It was known that some yearsago experiments were made in Francewhich showed conclusively that the bestlength of flue for a given diameter, for as compared with a straight flue sheet. With this data, it seemed desirable tohave a combustion chamber to keep thellue lengths down to proper proportions,a long flameway for gases, as much fire-box and combustion chamber heatingsurface as possible, and the introductionof superheated air to mix with and con-sume unburned gases before they en-tered the flues where, of course, all com-bustion ceases. Due to low water, a 2-8-0 type ofengine had blown down the crown sheetand distorted the whole back head. Itwas decided that, as tlie type of enginewas notoriously lacking in steaming ca-pacity, and was very extravagant withfuel, to rebuild the back head and in-clude a combustion chamber, hot airducts and liberal grate area. The enginewhich failed in this way was built in. F. F. Gaines. Supt. Motive Power. not warrant a local service in addition toa through service; so that, on a majorityof divisions, the service is combined. Asan illustration. Savannah to Macon miles. There are eighteen regularstops, five of these being of at least fiveminutes duration, on account of and the transferring of passengers,mail and express. There is one coalchute stop, three crossing stops andtwenty-two flag stops, making a possibletotal of forty-four. As a rule, few ofthe llag stops are omitted. The timecard for this distance allows six hoursand fifteen minutes, a schedule of ap-proximately miles an hour. Thetrains arc of steel construction, excepttlie local jleeperi, and a maximum trainof fourteen cars is quite frequent. These conditions require an enginecapable of quick acceleration and goodsteaming capacity, to allow of approxi- ;-2 TYPE ENGINE FOR THE CEXTR.\L OF RAILROAD. Lima Loco. Corporation
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