Just came back from Rajdhani, and... what a fantastic evening. Amazingly delicious food, attentive, friendly staff, quiet atmosphere - and after our meal they shows us the surprisingly small kitchen, had pictures taken, and talked and talked - a very joyful evening.
When you enter Fun Mall, which is a bit outside the center, but check Rajdhani's web page for a street map, don't be scared by the noise. The mall is nothing special, IMHO, too many western shops, way too much noise. But when you enter the restaurant... Things are much quieter.
You can have all the time you need to taste the amazing thalis at a very favorable price, and whenever you run out of something one of the friendly waiters will make sure that you get it. A dish you like especially - you get more.
This may be a big chain, but at least the Coimbatore restaurant is very special.
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