Electrical news and engineering . Smith. Calgary Most of the track was laid in a short period of years sothat rebuilding of track is badly needed. We have alreadyfiad to replace some of the special track work with solidcast manganese steel construction. In the matter of track bonding we believe that a wellbonded track is better, and certainly less costly, than manytons of return copper cables. An 80 lb. rail is equivalentto a 750,000 cm. and a double track of 4 rails is equalapproximately to 3,000,000 cm. of return cable. If thejoint resistance is made to four feet of rail, this means thata mi
Electrical news and engineering . Smith. Calgary Most of the track was laid in a short period of years sothat rebuilding of track is badly needed. We have alreadyfiad to replace some of the special track work with solidcast manganese steel construction. In the matter of track bonding we believe that a wellbonded track is better, and certainly less costly, than manytons of return copper cables. An 80 lb. rail is equivalentto a 750,000 cm. and a double track of 4 rails is equalapproximately to 3,000,000 cm. of return cable. If thejoint resistance is made to four feet of rail, this means thata mile of double track is equal to a return cable of 3,000,000cm. capacity a mile plus 10 per cent long. We use insulatedcopper return cables, of we should need a greatmany more than we have were it not for a well bondedtrack. Good bonding is the best safeguard against elec-trolysis. The type of bond used varies with conditions. Wherethere is paving we use the short flexible bond welded to the. 4 THE ELECTRICAL NEWS rail head, but wherever possible \vc use the long 4/0 OliioBrass Cos. bond with the steel terminal and weld it to thebase of the rail on each side of the fish plate. The lattertype of bond docs not interfere with work on tlie fish plateand is down out of the way where heavy truck wheelscannot rip it ofif. At special track work tlic rails and manganese steelcastings are all bonded together and reinforced by longleads which tie the ends of intersections together electric-ally. Fig. 2 is a plan of the car used in Calgary, showingthe seating arrangement, the location of the fare box, anddoor operating mechanism in the front vestibule. The rearvestibule is fitted up as a smoking compartment. Thecars are heated with Peter Smith hot air heaters using winter Cutler-Hammer electric space heaters were in-stalled in the smoking compartments. With a low ratefor electric power the question of heating the cars entirelyby electricity with the thermostat method of
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