User talk:190.238.169.51

Recent edit to Qinghai–Tibet Railway
Hello, and welcome to Wikipedia. I noticed that you made a change to an article, Qinghai–Tibet Railway, but you didn't provide a reliable source. It's been removed for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you!  Arun Kumar SINGH (Talk)  03:29, 18 November 2015 (UTC)