India by train: eSIM connectivity guide 2026

Coverage on major rail corridors

Indian Railways operates over 67,000 kilometers of track through some of the most diverse geography on earth. Coverage varies accordingly. The major intercity corridors that tourists use -- the Delhi-Mumbai trunk line, the Delhi-Kolkata route, the Golden Triangle (Delhi-Agra-Jaipur), and South India routes between Bangalore, Chennai, and Kerala -- are generally well-covered by Jio for most of their length. The flat plains of the Gangetic basin (Uttar Pradesh, Bihar, West Bengal) have consistent coverage from Jio towers with unobstructed reach across open terrain. Coverage is most consistent where the population is densest and where there are many towns and cities along the route.

Coverage becomes more variable on routes through mountainous terrain. The Konkan Railway on India's west coast between Mumbai and Goa passes through the Western Ghats with numerous tunnels and coastal geography that creates coverage shadows. The Northeast Express between Delhi and Assam passes through terrain that progressively weakens as the train moves away from the Gangetic plain into the hills of Assam. Mountain railways (the Darjeeling Himalayan Railway, the Nilgiri Mountain Railway to Ooty, the Kalka-Shimla Railway) are narrow-gauge heritage railways through mountain terrain where coverage is intermittent by the nature of the route. These mountain rail experiences are primarily scenic rather than data-dependent, and the coverage gaps are features of the journey rather than network failures.

IRCTC: booking trains and the data requirements

The Indian Railways ticketing system operates through IRCTC (Indian Railway Catering and Tourism Corporation) -- an app and website that is simultaneously one of the most essential and most frustrating booking tools in Indian travel. IRCTC ticket availability for popular trains and classes (particularly sleeper and AC 3-tier, the classes most used by backpackers and budget travelers) can fill weeks in advance. The booking process requires registration, an Indian phone number or international alternative for OTP verification, and navigation through a system that handles millions of simultaneous users with corresponding performance challenges.

For international travelers, IRCTC access is possible through the website and app, but payment can be challenging with international credit cards -- IRCTC's payment gateway has historically had issues with non-Indian cards. Alternatives include booking through authorized agents (many operate online and in travel hubs like Paharganj in Delhi), or the Tourist Quota allocation that reserves seats on major trains specifically for international visitors and can be booked at major railway reservation offices with a foreign passport. The data needed for IRCTC itself is modest -- the app and website are not data-heavy -- but the booking session requires a stable, reasonably fast connection for the payment step where timeouts cause the most frustration. Use hotel wifi or strong 4G for IRCTC booking sessions rather than attempting them on a slow or intermittent connection.

Using your eSIM productively during train journeys

Long Indian train journeys -- the 17-hour Delhi to Mumbai overnight, the 32-hour Delhi to Kolkata on the Rajdhani Express, the 40+ hour transcontinental routes -- are a cultural experience in themselves and an opportunity for a different relationship with connectivity. The Indian train compartment, whether in sleeper class or AC tiers, generates an organic social world of chai vendors, fellow passengers, platform purchases at station stops, and the rhythmic passage of India's geography through the carriage window. Many experienced travelers treat long Indian train journeys as intentional offline time -- downloading content before departure and engaging with the journey rather than continuously managing a data connection.

For travelers who need to use the journey productively for work or communication, the pattern follows the terrain: use the flat-plain sections for any time-sensitive data tasks, accept coverage gaps through mountainous and forested sections, and use station stops (which can be 5 to 20 minutes) as reliable data windows for syncing messages and uploads. Major junction stations (Jhansi, Itarsi, Nagpur, Waltair on the Mumbai-Delhi route) have strong coverage and platforms long enough for a brief data session during the stop.

Offline preparation for long train journeys

The pre-departure download routine for an Indian overnight train is more consequential than for a short-distance bus or ferry. A 15 to 40 hour train journey involves enough time that running out of offline content is a genuine problem. The preparation list: download your destination city offline map (not just the train route -- you need the arrival city), save accommodation details and contact locally, download any entertainment you plan to use for the journey (the offline portions can be many hours), have the IRCTC PNR (booking reference) accessible offline in the IRCTC app or as a screenshot, and save the contact information for anyone meeting you at the destination. A well-prepared departure from New Delhi Railway Station with full offline content and a charged phone makes a 15-hour overnight journey self-contained and comfortable. The first strong signal window after a long overnight will be at a major junction station, usually several hours into the journey -- do not plan any urgent communications for the first few hours if you have a late-evening departure.

The overnight train experience: connectivity as a secondary concern

A long Indian overnight train journey is one of travel's more distinctive social experiences. The AC 3-tier compartment -- six berths arranged in open bays along the carriage -- creates proximity with fellow travelers that generates organic conversation, shared food, and the kind of unhurried connection that has largely disappeared from modern travel. The chai vendor's call, the platform vendors at junction stops, the landscape passing from one geographic zone to another through a barred window -- these are experiences that a continuous data connection actively competes with. Many experienced India travelers who have done multiple long train journeys report that the journeys where they put the phone away and engaged with the compartment experience were the most memorable. This is not a connectivity guide's job to mandate, but it is worth naming as context for why the offline sections of long Indian train journeys are features rather than bugs from an experiential perspective.

Vande Bharat Express: India's high-speed train and its coverage

The Vande Bharat Express semi-high-speed trains, which have expanded their network significantly since 2022, represent a different class of Indian rail travel. Operating at up to 160 km/h on existing track, these trains are faster, more comfortable, and increasingly well-covered by mobile networks than older rolling stock on the same routes. The Delhi to Varanasi Vande Bharat (approximately 8 hours), the Mumbai to Goa service, and the Bangalore to Chennai service all have good Jio coverage for most of their routes. Some Vande Bharat services have onboard wifi from IRCTC, though reliability varies. For travelers who want to use train time productively for work or communication, the Vande Bharat services on major tourist corridors provide a better connectivity environment than overnight sleeper trains, combined with significantly shorter journey times. The trade-off is that they are more expensive and less culturally immersive than the overnight experience.