The train journey, background music and feel is similar to Satyajit Ray's film Sonar Kella. The film shows mostly parts of Rajasthan and tried to keep the journey and feel like India.
Though they mentioned the brothers mother stays in Himalayas but couldn't actually gave the feel in those 15-20 mins scene with their mother. Darjeeling as a queen of hills may justify that, not sure.
Three characters play was great and actors did great job in that.
Overall it's good film to watch.