Top contact unprotected conductor rail for 600 volt traction systems

Abstract

The paper treats with the various factors which enter into consideration in the design of a 600 volt contact rail system. The weight of rail to be used depend upon conditions met with in each case, but in general, a heavy rail is preferable from all points of view. The question of quality is rather indeterminate, but in general, it is not advisable to use soft steel until the weight has been brought up to at least 80 lb. (36.28 kg.) per yard, however, consideration should be given to it above this weight. Insulating and supporting is a mechanical problem which must be decided upon local conditions. The method of bonding and jointing to be used depends upon size and section of rail used. With A. S. C. E. standard, the foot bond is the most satisfactory, above this weight and with special sections of rail a copper welded joint will be very satisfactory. Provisions must be made to control the expansion and contraction of rail by cutting it into sections and anchoring each of these sections. Various methods of connecting rails are described together with special devices which will be required. The costs of constructing a single track mile of contact rail uisng 50 lb. (22.68 kg.) rail is $3,284.29 while the cost of the same amount of 80 lb. (36.28 kg.) rail is $4,028.55. The average maintenance cost per mile of rail, exclusive of entire renewal, is $80.00 per mile per year.