The Delhi Railway Police’s all-India 24x7 helpline number 1512 — started on July 17 — is doing a wonderful job with the control room receiving 50 distress calls within a week, said an officer.Drug, robberies and mobile thefts are the most common cases reported in the trains through these calls, said the officer. At least in 10 such cases, the Delhi Railway Police registered zero FIRs and sent them to their respective police stations across the country.