. Electric railway journal . tiveoffices, etc., was sixty-four 47-ft. cars, and the new car-houses will provide space for seventy additional is to be noted that the plan adopted gives thisadditional storage on an area only 50 per cent of thatoccupied by the old building. Preparing for the Addition The grades of the streets intersecting at the car-house are such that trackage will be available in theenlarged structure on two levels, as the level of themain entrance on Geary Street becomes the secondstory when extended over the area occupied by theaddition which fronts on Presidio Avenue
. Electric railway journal . tiveoffices, etc., was sixty-four 47-ft. cars, and the new car-houses will provide space for seventy additional is to be noted that the plan adopted gives thisadditional storage on an area only 50 per cent of thatoccupied by the old building. Preparing for the Addition The grades of the streets intersecting at the car-house are such that trackage will be available in theenlarged structure on two levels, as the level of themain entrance on Geary Street becomes the secondstory when extended over the area occupied by theaddition which fronts on Presidio Avenue. This ad-vantage, however, was not gained without expense, asit was necessary to excavate 24,000 cu. yd. of earth androck from the site of the addition before it was broughtdown to the level of the Presidio Avenue grade, andthen it was deemed wise, in the design of the wallagainst the uphill side, to allow for partial hydrostaticthrust from the bank which is nearly 40 ft. high. 668 ELECTRIC RAILWAY JOURNAL [Vol. XLV, No. 14. Another feature of the work was the removal of therear concrete wall of the old building-. The wall hadbeen founded at different levels, according to the slopeof the hill, and in order to excavate to the desired levelfor the addition, it was necessary to take out thegreater part of the old wall footings. Also the wall hadto be broken through on the Geary Street level so asto give direct access to tracks on the second floor of theaddition, and it was found cheaper to do this beforethe excavation was completed. In preparation for theremoval, the wall panels were first cut through onthree sides by compressed air drills, and where neces-sary hack saws were used to cut the reinforcing. The slabs were then thrust out by means of ahydraulic jack which worked against an inclined 14-in. timber braced against the top of the slab to bebroken out. A sufficient bearing for this thrust wasfound on the concrete floor beams of the the panels had be
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