What is the theme in Train to Pakistan by Khushwant Singh?

Religious strife is the main theme of this book. Mano Majra is a small town divided between Sikhs and Muslims; until Lala Ram Lal is killed, there is a prominent Hindu family in town as well. There is no deep tension between these differing religious groups, an impressive social achievement particularly in a time with such deep religious tension. Religious tension was radically exaggerated during the partition period, however, and this put a massive strain on religious peace and tolerance in Mano Majra towards the end of the book.