Namma Metro keeps its rules fairly simple, but there's one cost you should know about before you show up with a big suitcase.
Luggage limits
Each piece of luggage should stay within 60 × 45 × 25 cm. Bring something bigger and you'll pay an extra ₹30 for the oversized piece - not a huge amount, but worth budgeting for if you're heading to or from the airport-bound bus interchange with check-in bags.
What's not allowed
- Pets - not permitted on trains or in stations
- Smoking - the entire system is a smoke-free zone
- Firearms - only permitted with prior security approval, don't assume you can just carry one through
- Inflammables - petrol, kerosene, firecrackers, and similar items are all banned
- Leaking bags - anything that's dripping or spilling won't get past security
- Drunk or unruly behaviour - staff can and will refuse entry or ask you to leave
The practical takeaway
Security checks at Namma Metro stations are quick but real - your bags go through a scanner at entry. If you're carrying something borderline (a large suitcase, sports equipment, anything unusual), expect a question from security rather than an automatic pass-through.
Bottom line
Keep bags under 60 × 45 × 25 cm to avoid the oversized surcharge, leave pets and flammables at home, and you won't have any trouble getting through the gates.