The four prisoners had mattresses instead of simple cement slabs for sleeping, their own kitchen, toilet, a television set and an aqua-guard water purifier.
Estimated to cost about Rs 81 lakh per coach, about 700 such modern coaches will be manufactured in the current fiscal.
At least 21 persons died on Sunday when the tourist boat carrying them capsized in the Bay of Bengal near Port Blair in the Andaman and Nicobar islands, official sources said. The boat carrying 45 people -- tourists from Kanchi Puram district of Tamil Nadu and Mumbai, and crewmembers -- sank on its way from Ross Island to North Bay.
Eyewitnesses to the boat tragedy also claimed that there was a blast before the capsize and that there was an hour's delay before the marine rescue team could reach the spot.
