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500: Mainline

The analyze_train program shown in Segment 484 produces an array of pointers to engine, box_car, tank_car, and caboose objects. Subsequently, the analyze_train program uses a for loop to display short names:

// Display classes using display_short_name virtual function:
for (n = 0; n < car_count; ++n) {
  train[n] -> display_short_name ( );  
  cout << endl;