. Electric locking . essity of the placing of extra insulated joints in the main linerail. It gives more protection than the shunt fouling. However,when summing up the situation as to whether to employ shuntor series circuit at a certain location, it is merely a question oftrack conditions, and if the advantages present from a protectionstandpoint outnumber the disadvantages existing when seen froman operation point of view. Separate Fouling Circuit. The third scheme of employinga separate circuit is decidedly the one most preferable, but it re-quires additional track relays, introducing incre
. Electric locking . essity of the placing of extra insulated joints in the main linerail. It gives more protection than the shunt fouling. However,when summing up the situation as to whether to employ shuntor series circuit at a certain location, it is merely a question oftrack conditions, and if the advantages present from a protectionstandpoint outnumber the disadvantages existing when seen froman operation point of view. Separate Fouling Circuit. The third scheme of employinga separate circuit is decidedly the one most preferable, but it re-quires additional track relays, introducing increased maintenanceexpense, so its use is mostly restricted to places where the foulingcircuit is of a prohibitive length, which would either make a seriesfouling too complex or expensive or a shunt fouling too unsafeor unreliable. Fouling at Grade Crossings., A grade crossing showing theapplication of a shunt fouling with the employment of a single railtrack circuit is ■ illustrated in Fig. 18. A train moving towards. fig. 18. the crossing from either direction on the fouling track will, assoon as the first pair of wheels have passed either the insulatedjoint C or D, shunt the track relay B. The most seriousobjection offered to the shunt fouling is the possibility of thebreaking of any of the rails in the fouling circuit as at X, orthe jumpers 4 and 6, will render the fouling protection ineffective 26 THE TRACK CIRCUIT and would remain undetected until discovered either on inspec-tion or when a car within the fouHng limits would fail to de-ener-gize the relay. In view of this it should be evident that as faras the turnout or crossing tracks are concerned, no broken railprotection is provided in the shunt fouHng scheme. In connection with the description of the shunt fouling, atten-
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
