Trapezoidal speed-time curve is
(A) an exact representation of the conditions in Main-line traction service.
(B) an exact representation of the conditions in Suburban traction service.
(C) a close approximation of the conditions in Suburban traction service.
(D) a close approximation of the conditions in Mainline traction service.
(A) an exact representation of the conditions in Main-line traction service.
(B) an exact representation of the conditions in Suburban traction service.
(C) a close approximation of the conditions in Suburban traction service.
(D) a close approximation of the conditions in Mainline traction service.