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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 8: BRAKING
+
+// EXAMPLE : 8.4 :
+// Page number 810
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+W = 355.0        // Weight of train(tonne)
+V_1 = 80.5       // Speed(km/hr)
+V_2 = 48.3       // Speed(km/hr)
+D = 1.525        // Distance(km)
+G = 100.0/90     // Gradient(%)
+I = 10.0         // Rotational inertia(%)
+r = 53.0         // Tractive resistance(N/tonne)
+n = 0.8          // Overall efficiency
+
+// Calculations
+beta = (V_1**2-V_2**2)/(2*D*3600)   // Braking retardation(km phps)
+W_e = W*(100+I)/100                 // Accelerating weight of train(tonne)
+F_t = 277.8*W_e*beta+98.1*W*G-W*r   // Tractive effort(N)
+work_done = F_t*D*1000              // Work done by this effort(N-m)
+energy = work_done*n/(1000*3600)    // Energy returned to line(kWh)
+
+// Results
+disp("PART IV - EXAMPLE : 8.4 : SOLUTION :-")
+printf("\nEnergy returned to the line = %.1f kWh", energy)