Set your mind at ease. There is no caste system, everybody can ride a train. Maybe you are in low caste and are forbidden in riding some fancy trains in India, but you will be allowed to ride in China in any train as long as you can pay. (BTW, last time I hear 8 Rupee can only change for 1 Yuan, then tough luck!)
People are not allowed to enter danger zone, so the people don't. That's the rule in China and the Chinese people follow the rule. Perhaps it would be opposite in India… Dude, a simple advice: don't view China with your Indian mindset, or you will be perplexed, confused, and lost...