<p>Bengaluru Metro's Purple Line was fully operational from October 9, without any official inauguration. </p><p>The 2.1-km Baiyappanahalli-KR Pura and 2.05-km Kengeri-Challaghatta sections opened to the public at 5 am. </p><p>They are part of the Purple Line, which will stretch from Whitefield in the east to Challaghatta in the west and span 42.85 km.</p>