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Bangalore to Chennai : Bangalore ( now Bengaluru) is the capital of Karnataka whereas Chennai ( also known as Madras) is the capital of Tamilnadu. Both are south indian states , the former facing the Arabian Sea and the later along the Bay of Bengal

There are mainly two roads from Bangalore to Chennai. One is via Krishnagiri and the other is via Chittoor in Andhra pradesh . Technically the road via Chittoor is the shortest . Bangalore to Chennai via Chittoor is about 340 kilometers (210 miles) and can take anything up to 9 hours drive.

But most prefer the road via Krishnagiri as it is a great road to drive on, though a tad longer.

People prefer the road to Chennai from Bangalore via Krishnagiri as it is a great road to drive on, though a tad longer.

Bangalore to Chennai road distances via Krishnagiri is about 360 kilometers (210 miles) . The road segments are Bangalore to Krishnagiri by NH7 , Krishnagiri to Vellore by NH 46 and then to Chennai by NH 4.
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Bangalore to Chennai route ( via Krishnagiri) : Bangalore > Electronic City > Chandapura > Attibele > Karnataka-Tamil Nadu Border – Hosur > Krishnagiri > Ambur > Vaniyambadi > Walajabad > Vellore > Ranipet > Kanchipuram > Sriperumbudur > Poonamallee > Chennai

NH 4 goes all the way from Bangalore to Chennai via Andhra Pradesh. So the private car/bus operators need 3 state permits.

Bangalore to Chennai route ( via Chittoor) : Bangalore > Hoskote > Kolar > Mulbagal > Karnataka – Andhra Pradesh Border > Palmaner > Chittoor > Naraharipeta > Andhra Pradesh > Tamilnadu Border > Tiruvallam > Walajepet > Kancheepuram > Sriperumbdur > Poonamallee > Chennai

There are many private operators and the state run buses that ply regular bus service between Chennai and Bangalore.

Bengaluru – Chennai Railway map : Cauvery Express / Kaveri Express connects the capital city of Karnataka State with capital of Tamilnadu

Bangalore to Chennai Trains : There are about 16 express trains operating between Chennai and Bangalore. Out of which 5 are daily trains. Also there are two the upscale Shatabdi Express trains that operate daily except on Tuesdays.

Popular Bangalore to Chennai trains include Kaveri Express, Lalbagh Express, Chennai Mail, Sangamitra Express and Brindavan Express . It typically takes anything from 5 hours for the Bangalore to Chennai Shatabdi Express to 7 hours for other express trains to cover the Bangalore – Chennai distance. Chennai to Bangalore route pass via the major stations Arakkonam , Walajah Road Jn, Katpadi Jn and Jolarpettai. Stops vary depends on the train.