In construction of new tube between Highgate and East Finchley, engineers have evolved rapid means of placing rails in 12-ft diam tunnel; rails are welded together into lengths of 300 ft in mobile electric welding unit; six welded rails comprise work for one shift, and during day they are loaded on train; at night battery driven locomotive pushes train with its load and gang of men to limit of rails laid in tunnel during previous shift.
Laying long rails in tube
Engineer
Engineer ; 167 , n 4342
1939
Article (Journal)
English
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