To provide better amenities to passengers, Railways on Tuesday in New Delhi unveiled a new AC 3-tier coach here with state-of-the-art facilities including CCTV cameras, bio-toilets and improved safety features. The interiors of the coach, with better security and comfort features, have been designed aesthetically, said Railway Board Member (Mechanic) Hemant Kumar. While CCTV cameras have been installed at the entrance of the coach on both the sides to strengthen the security system, fire-retardant materials have been used to prevent fire as a safety measure.