Sources in this brief cover Delhi to Mathura and Vrindavan only, not Srinagar, so no verified Srinagar distance or train time exists yet. For Mathura, the road is about 183 km, roughly 3 hours 4 minutes by car via the Yamuna Expressway. If you are looking into train travel from Delhi to Srinagar, this page will be direct about what I can and cannot confirm. I have not yet verified a Srinagar...