For over six decades, India's passenger trains ran on the same basic idea. A powerful locomotive up front, pulling a long string of passive coaches behind it. As of March 2018, 49,033 conventional coaches were still in service. Then, in January 2018, the ICF flagged off its last one.🧵👇 Since 1955, the Integral Coach Factory in Chennai and its sister factories have built over 75,000 coaches of all types. For most of that history, the dominant design was the conventional ICF coach. What replaced them, and why, is a story that goes beyond a simple paint upgrade.

The Indian Railways runs thousands of passenger, freight, and express trains on a shared, tightly coordinated network. For most of this network's history, what kept those trains apart was signals along the track and the locomotive pilot's instinct. Manual judgement left room for errors. Let's find out how India is changing this. 🧵👇 The single biggest safety risk on this network has been something called SPAD: Signal Passed At Danger. That's when a driver misses or misjudges a red signal, and the train enters a section it shouldn't be in. Training helps, but it can't eliminate the problem.

In India, the unemployment rate for illiterates is 3%. For graduates aged 15 to 24, it's 40%. The more educated you are in this country, the more likely you are to be jobless. Not because education is worthless, but because it creates aspirations the economy struggles to absorb. 🧵👇 An illiterate worker takes whatever survival work is available. A graduate holds out for something better. And that something better, for millions, may never arrive.

India's defence exports hit a record ₹38,424 crore in FY26, up 62.66% from the previous year. Ten years ago, defence was not a private-market story in the way it is now. The domestic industrial ecosystem was narrow, state-heavy, and deeply dependent on imports. How did we get here?
Let's find out. 🧵👇 To be clear, the dependence hasn't fully vanished. MP-IDSA noted last year, drawing on SIPRI data, that India was still the world's largest arms importer in 2019-2023, with around 9.8% of global imports. But something important has changed. Defence production has risen from ₹46,429 crore in 2014-15 to ₹1.50 lakh crore in 2024-25. In FY25 alone, the Ministry of Defence signed 193 contracts worth ₹2.09 lakh crore, of which ₹1.69 lakh crore went to domestic industry.

Since the Hormuz crisis began, polymer prices surged over 40% in weeks. Naphtha nearly doubled. Indian PVC prices jumped 78% in a single month. Asian plastic factories are going dark. American ones are running at maximum capacity. And somewhere in all this, we realised we don't actually understand what plastic is.🧵👇 We kept using terms like polymer, naphtha, PVC, polyethylene, without really knowing what each meant. Every explanation starts with crude oil. But that's like explaining what a cake is by starting with the wheat farm. It tells you where the ingredients come from, not what the thing actually is.

The GST was designed with a brilliant built-in trick. Every buyer has a financial reason to demand a proper invoice from their seller, because that invoice is how they claim tax credit. So buyers police sellers automatically, and the system enforces itself. Except it doesn't, not really. 🧵👇 According to a recent paper by economists Arbind Modi and Ajay Shah, a series of design choices around credits and refunds have quietly broken the compliance chain the GST depends on. What was meant to tax consumption has drifted into taxing production instead.

India runs one of the most unusual policy experiments in the world. Since 2014, any sufficiently large Indian company is legally required to spend a fixed share of its profits on social causes. Not just disclose it. Actually spend. No other major economy on earth does this.🧵👇 Other countries have tried softer versions. The EU's Corporate Sustainability Reporting Directive requires companies to publish detailed data about their environmental and social footprint, but doesn't require them to open their wallets. India's Section 135 of the Companies Act does precisely that.

If you have a piped gas connection at home but you're still holding on to an LPG cylinder as backup, the government has news: surrender it within 90 days, or lose your cooking fuel supply entirely.

Here's what's happening, and why.🧵👇 The Ministry of Petroleum and Natural Gas has invoked the Essential Commodities Act to force a shift. Oil marketing companies will digitally map addresses and automatically block LPG cylinder bookings for any household where piped natural gas (PNG) is available.

India just committed ₹4,000 crore to a business most people have never thought about: dredging.

The Dredging Corporation of India wants to more than double its revenue to ₹3,000 crore over five years. It is buying 11 new dredgers. All to do one thing. 🧵👇 Clear sand, silt, and rock from the bottom of harbours, rivers, and shipping channels so that large ships can pass through.

Government estimates suggest India will need roughly 3 billion cubic metres of dredging over the next decade. Every major port depends on it to stay open.

This month, America's National Oceanic and Atmospheric Administration issued an El Niño Watch. Formal signal that conditions are becoming favourable for El Niño to develop. La Niña, which gave India above-normal monsoon in 2025, is fading. By August, there's 62% probability El Niño conditions will be underway. Let's find out what this means. El Niño is far from distant weather phenomenon for India. It disrupts Southwest Monsoon winds that Indian rains depend on. That increases occurrence of heatwaves, depresses agricultural output, lifts food prices, strains power grid. Its impact on Indian economy is almost decisively negative.

Every few months, RBI's Monetary Policy Committee meets to answer one question, is inflation too high, too low, or just right? Since 2016, the answer revolves around one number, 4% inflation, give or take 2 percentage points either side. But how did we get here? For much of last year, inflation was under 2%, just outside RBI's tolerance band of 4% ± 2%. If inflation falls too fast, people aren't buying things enough. RBI even cut rates last year to spur consumer demand.

Raajmarg Infra Investment Trust wants to raise ₹6,000 crore by selling you the right to collect tolls on five highway stretches across 260 kilometres. This becomes only the 7th InvIT to hit public markets since 2014, but most investors still don't understand what they're actually buying. Let's find out in this thread below. InvITs are REITs' less-famous cousins. Same trust structure, but instead of office buildings and rent cheques, you're paying for infrastructure assets and their cash flows. Highways, power lines, telecom fibre.

NSE IX just launched Global Access, letting Indians buy US stocks like Apple and NVIDIA directly through GIFT City. It works under RBI's Liberalised Remittance Scheme (LRS). But the real story isn't the product. It's what happens to your order once it reaches the US. That market looks nothing like India's. Let's take a look in this thread. Indians have been buying US stocks for years through apps. But those apps were wrappers. The actual trading was handled by American firms like Viewtrade. Your money left India under LRS, landed with a US broker, and no Indian securities regulator was in the middle

The war in the Middle East isn't just a geopolitical crisis. It's a direct threat to how a fifth of the world's oil reaches the rest of the world. To understand why, you need to look at where the oil actually sits and how few ways out it has. 🧵👇 Let's start with the map. The Arabian Peninsula sits between two narrow water corridors: the Persian Gulf to the east, and the Red Sea to the west. At the tip of each is a bottleneck. These two straits are arguably the most critical chokepoints in the global economy.

India raced to build solar factories so fast that we already surpassed our 2030 renewable capacity target. But all this speed has created a strange problem: we now have more solar supply than the market can absorb. 🧵👇 Manufacturers are sitting on huge inventories and cutting prices just to keep factories running. Margins have collapsed, and some companies have slipped into losses.

Image: PIB

We know transformers keep the grid running, but most of us never stop to ask what they actually do or why they matter so much.

So we dug into the transformer industry. How they work, why global supply is strained, and where India fits into this story. 👇 Start with the basics. A transformer’s job is simple: change electricity from one form into another. High voltage to low, or low to high.

Any discussion about AI today eventually lands on a single question: is AI a bubble? 🧵👇 Bubbles aren’t always bad. Many big technological shifts, from smartphones to the internet, came out of bubbles. What matters is how a bubble is built and whether the investment remains useful even if it bursts.

300+ Indian companies reported earnings last week.

We dug through most their con calls — and found 22 worth paying attention to.

Here are the 8 sharpest and most revealing things Indian management teams said. The entire marketing strategy of consumer brands hinges on this number. Nykaa’s doubling down on Gen Z isn’t a vibe — it’s math.

The quick commerce industry is moving faster than anyone expected. So much has changed in just a few months that it is worth stepping back to see where things stand. A 🧵 on whats happening. Zepto raised new capital and is now rumored to be inching toward an IPO. Reliance Retail said it has shifted its quick-commerce model to 30-minute delivery by riding on its nationwide store network. Swiggy is raising funds after earlier saying it did not need external capital. Blinkit is adding stores at record speed. The momentum is remarkable.

India’s energy story is entering its most ambitious phase yet.

We’re building new renewable capacity, modernising our grids, and revamping how electricity moves across the country. Here's what's happening 🧵👇 According to the National Electricity Plan, India’s power capacity could hit 609 GW by 2027 and 900 GW by 2032. That’s nearly double today’s capacity.

In October, a bunch of headlines caught our eye: the government was pushing for “coal gasification” and had just opened auctions for underground gasification blocks.

That sounded strange. Coal is solid. How on earth do you turn it into gas? 🧵👇 That question led us down a fascinating rabbit hole.

Because what India’s trying now could completely change how we use coal, our dirtiest but most abundant fuel.