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+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION 
+
+// PART IV : UTILIZATION AND TRACTION
+// CHAPTER 5: ELECTRIC TRACTION-SPEED TIME CURVES AND MECHANICS OF TRAIN MOVEMENT
+
+// EXAMPLE : 5.11 :
+// Page number 784
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+W = 400.0       // Weight of train(tonne)
+G = 100.0/75    // Gradient
+alpha = 1.6     // Acceleration(km phps)
+r = 66.75       // Train resistance(N/tonne)
+I = 10.0        // Rotational inertia(%)
+V = 48.0        // Speed(kmph)
+n = 0.7         // Overall efficiency of equipment
+
+// Calculations
+W_e = W*(100+I)/100                  // Accelerating weight of train(tonne)
+F_t = 277.8*W_e*alpha+W*r+98.1*W*G   // Tractive effort(N)
+t = V/alpha                          // Time(sec)
+energy_a = F_t*V*t/(2*3600**2)       // Energy usefully employed(kWh)
+G_r = 98.1*G+r                       // Force(N)
+work_tonne_km = G_r*1000             // Work done per tonne per km(Nw-m)
+energy_b = work_tonne_km/(n*3600)    // Energy consumption(Wh per tonne-km)
+
+// Results
+disp("PART IV - EXAMPLE : 5.11 : SOLUTION :-")
+printf("\nCase(a): Energy usefully employed in attaining speed = %.2f kWh", energy_a)
+printf("\nCase(b): Specific energy consumption at steady state speed = %.1f Wh per tonne-km", energy_b)