If you are late for work in Mumbai and reach the station just as the train is leaving the platform, don't despair. You can run up to the packed compartments and find many hands unfolding like petals to pull you on board. And while you will probably have to hang on to the door frame with your fingertips, you are still grateful for the empathy of your fellow passengers, already packed tighter than cattle, their shirts drenched with sweat in the badly ventilated compartment. They know that your boss might yell at you or cut your pay if you miss this train.

Indian Muslims have stayed very far away from Al Qaeda and the like; they have voted with their feet and stayed in the country, rather than going to Pakistan during partition. On the whole, they recognize that life is better for them in India than in Pakistan.

Commuter trains are the easiest target for terrorists, as we have seen in Madrid, London, and now Bombay. But it is difficult for a Westerner to comprehend the kind of overcrowding in a Bombay local train; they ferry six million passengers a day. A bomb that goes off in one of those compartments will have maximum impact.

A city like Bombay, like New York, that is a recent creation on the planet and does not have a substantial indigenous population, is full of restless people. Those who have come here have not been at ease somewhere else. And unlike others who may have been equally uncomfortable wherever they came from, these people got up and moved. As I have discovered, having once moved, it is difficult to stop moving.

The trains are central to Bombay just as the subway is central to New York; they are the great social laboratory of that city. And today, they became a charnel-house.

Each person’s life is dominated by a central event, which shapes and distorts everything that comes after it and, in retrospect, everything that came before.

It was when I realised I had a new nationality: I was in exile. I am an adulterous resident: when I am in one city, I am dreaming of the other. I am an exile; citizen of the country of longing.