Traveled in SL from DEE to DDN. Gets really filled up at DLI so better to board from DEE if it suits you. Coaches and toilets are clean and maintained, yet the rakes are old ICF. Charging points in each bay. Well manned by RPF personnel at night, so security is good. Get breakfast from haridwar as on board catering is poor. Reaches on an average 30-60 minutes late, so avoid if you are in a rush.