A. Corrosion problems in the under-ground pipe work B. Short time power failure interrupts traffic for hours C. High capital outlay in fixed installations beside route limitation D. Interference with communication lines
A. High in case of d.c. traction than in the case of ac. traction B. Low in case of d.c. traction than in the case of ac. traction C. Equal in both ac. and d.c. traction D. Any of the above
A. It has longer free running period B. It has longer coasting period C. Accelerating and braking periods are comparatively smaller D. All of the above
