Most of Hyderabad Metro's rules are what you'd expect from any Indian metro system - but one item on the banned list is distinctly local.
Luggage size and weight
Bags are limited to 65 × 45 × 25 cm. On weight, sources genuinely differ: the commonly cited operational rule allows up to 40 kg per passenger, with a ₹1 per kg surcharge beyond 10 kg - but at least one official HMRL FAQ states there's currently no strict luggage weight restriction in practice. Treat 40 kg as a safe upper bound to plan around rather than a confirmed hard cap, and don't be surprised if enforcement varies by station.
What's banned
The standard prohibited list applies: matchboxes and lighters, petrol and kerosene, gas cylinders, stoves, explosives and other inflammables, knives, scissors, and sharp-edged objects.
One rule that's genuinely specific to Hyderabad: gunny bags of rice or wheat are explicitly banned - a rule that makes more sense once you consider how much bulk grain moves through the city day to day. If you're carrying provisions in bulk, repack into a proper bag before you head to the station.
Unattended belongings and luggage are also prohibited, same as most systems - don't leave a bag on a seat while you step away.
Bottom line
Keep bags under the size limit, budget for a possible per-kg surcharge on anything over 10 kg, and if you're carrying bulk grain for any reason, repack it. Everything else is standard-issue metro etiquette: no explosives, no sharp objects, no unattended bags.