. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . = 6 trains. Allow two trains for uneven spacing. Total trains = 8. Cars per train = 8. Total cars required for service = 64. Assume old equipment to be returnedand improved equipment to be put onat $200 per car. Cost improved equipment = 64 X 200= $12,800. Return on investment = 7,750 -f- 12,800= per year. has related to steam and electric roadpassenger car brakes, but the develop-ment in air brakes has not been confinedto passenger cars. In many respects the freight car brakeshave
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . = 6 trains. Allow two trains for uneven spacing. Total trains = 8. Cars per train = 8. Total cars required for service = 64. Assume old equipment to be returnedand improved equipment to be put onat $200 per car. Cost improved equipment = 64 X 200= $12,800. Return on investment = 7,750 -f- 12,800= per year. has related to steam and electric roadpassenger car brakes, but the develop-ment in air brakes has not been confinedto passenger cars. In many respects the freight car brakeshave been improved upon to the sameextent as the passenger brake, consideringthat there are but two sizes of equipmentin general use, at least up to the pointwhere electric control is added to thepneumatic brake., The development of the type K triplevalve has made possible the satisfactoryoperation of the brakes on 100 car freighttrains and incidentally added a factor ofsafety to the control of trains on descend-ing grades, but as the maximum braking 130 RAILWAY AND LOCOMOTIVE ENGINEERING. April, effect of a freight car is limited to acertain percent, of the light weight of thecar, the standard Drake provides absolute-ly nothing in the way of an efficient brakefor a loaded car, which has been the prin-cipal reason for the design and perfec-tion of the empty and load brake forfreight cars. The use of large powerful locomotiveshas made it possible to haul long trainsof cars up heavy grades, but in order tohandle even moderate lengths of heavilyloaded trains in descending heavy grades,it is frequently necessary to provide ahigher braking power for the train thancan be developed on heavily loaded carsby the standard brake alone. As a resultit has been customary to divide the trainsin sections in descending the grades anduse hand brakes with the air brakes toassist in holding the train and sometimesempty cars have been hauled among theloads in order to increase the total per-cent,
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