I doubt that any Indian train can make it between the two cities in two hours.
There are a number of trains between Chennai and Bangalore, though. At least 6 trains if my memory serves me right. The fastest of the lot would be Shatabdi Express between the two cities.
It usually takes about 6 hours to get from one city to the other. Taking a domestic flight would end up taking as much time considering commute to and from airports, check-in time, etc., although time in air would be just 45 minutes. Trains take you right into the city; but airports are on the outskirts.
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