Letter to BS: Can bridges take the load increased by more than three times?

That was the title of the movie and book on Operation Market Garden — the largest paratroopers cum ground force operation in military history carried out in 1944. The Allies needed to capture three bridges but they failed. But in India, particularly in Mumbai, every suburban train commuter needs to “capture” bridges at least four times in his daily sojourn. The first issue is that when an accident takes place, all authorities compete to point out who is not responsible. If the bridge belongs to and is the responsibility of the Indian Railways, then will the municipal authorities also cede