. Electric railway journal . er pole construction is common on both city and in- at Necaxa, 100 miles away. The company maintains, how-ever, a large steam-power station adjoining the shops andcar barns at Indianilla, about 1% miles from the station, which is used only in emergencies and to as-sist in carrying the peak load at seasons of heavy traffic,contains 11 250-hp Babcock & Wilcox water-tube boilersand five Mcintosh & Seymour engines direct connected tothree 850-kw and two 400-kw generators. Current from the hydro-electric generating station atNecaxa is brought into the city at
. Electric railway journal . er pole construction is common on both city and in- at Necaxa, 100 miles away. The company maintains, how-ever, a large steam-power station adjoining the shops andcar barns at Indianilla, about 1% miles from the station, which is used only in emergencies and to as-sist in carrying the peak load at seasons of heavy traffic,contains 11 250-hp Babcock & Wilcox water-tube boilersand five Mcintosh & Seymour engines direct connected tothree 850-kw and two 400-kw generators. Current from the hydro-electric generating station atNecaxa is brought into the city at a potential of 60,000volts by an overhead transmission line carried on steeltowers. It enters the main substation at Nonoalco, andfrom here it is distributed to four substations, called re-spectively La Nana, near the Alameda; Indianilla, adjoin-ing the steam power station; Tlaxpana, in the northwest-ern district, and Churubusco, in the southeastern part ofthe city, all receiving the current at 20,000 volts and dis-. Mexico City Tramways—Indianilla Reserve Steam Plant, Substation and Storage Battery House, Showing Incoming 20,000-Volt Power Lines terurban li nes. On the broad avenues in the city the orna-mental iron center poles have a much better appearancethan the span-wire construction with poles set next to thecurb, which is so generally used in the United States. Allpoles are of steel tubing, as wood poles, unless thoroughlytreated with creosote or some other efficient preservative,suffer dry rot very rapidly. Even treated wooden poleshave a very short life in exposed locations. Wood polesof suitable size and quality also are not to be found inMexico in any quantities and have to be imported at highcost from the United States. The company maintains anefficient corps of linemen, who are supplied with mule-drawn and automobile tower wagons. POWER SUPPLY Most of the power for operating the tramway system isobtained from the hydro-electric generating station located tributi
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