Railway Group D Exam PWB Book (English) is published by Kiran Prakashan. It is available in English medium. Best Guide Book cum Reference Book for Railway / RRB Exam Preparation. Consist of Previous Years Solved Question Papers. RAILWAY GROUP ‘D’ ONLINE CBT MOCK TEST PRACTICE WORK BOOK (ENGLISH). Useful for the recruitment exam to the post of: Trackman, Helper, Porter, Gangman, Gateman, Khalsi, Attendant and other Group D Exams conducted by different Railway Zones.