. Electric railway journal . a transfer busand then to the main bus structure. The concrete busstructure was built by the F. F. Jonesberg Company,Boston. It was cast in place as one solid piece and itaccommodates duplicate K-12 oil switches and busconnections for all 2300-volt and 4000-volt circuits. The twenty-nine-panel control board, high and low-tension switch gear transformers, and automatic regu-lators and their wiring were furnished and installedby the General Electric Company. The conduit andstation lighting was installed by the Lord Electric Com-pany, Boston. Provisions for Relia


. Electric railway journal . a transfer busand then to the main bus structure. The concrete busstructure was built by the F. F. Jonesberg Company,Boston. It was cast in place as one solid piece and itaccommodates duplicate K-12 oil switches and busconnections for all 2300-volt and 4000-volt circuits. The twenty-nine-panel control board, high and low-tension switch gear transformers, and automatic regu-lators and their wiring were furnished and installedby the General Electric Company. The conduit andstation lighting was installed by the Lord Electric Com-pany, Boston. Provisions for Reliability of Service The development as described shows to what greatlengths the company has gone in order to provide atBrook Street a reliable source of power for its cus-tomers, of whom the three street railway companies areof particular importance. To serve these the companyhas installed a new 2000-kw., 600-volt Westinghousemotor-generator set, to supersede several small unitsand supplement the 1500-kw. and 500-kw., 600-volt. MANCHESTER POWER—EXTERIOR VIEW OP ADDITION TO BROOKSTREET SUBSTATION CONTAINING CONVERTERS AND TRANS-FORMERS THAT SERVE BOTH RAILWAY ANDLIGHTING LOADS General Electric motor-generator sets that were previ-ously in service. The motor of the 1500-kw. set hasbeen rewound from 11,000 volts to 4000 volts, and the500-kw. set has been reconstructed from a 2000-volt toa 4000-volt rating. All three motor-generator sets havesynchronous motors now operating on the 4000-voltsystem in the new station. The old railway switchboard at Brook Street had bothpositive and negative buses mounted in back of thepanels, with switch connections such that the machineswere equalized on the positive side. In the new substa-tion the above-mentioned board is superseded by a mod-ern, General Electric, single-polarity railway board ar-ranged for equalizing machines on the negative sidewith equalizing buses and negative buses run directlyunder the machines. A special feature of this boa


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