WhistleDrive, a business-to-business transportation services company, has raised Rs 72 crore in Series-B from the Chicago-based Colosseum Group. The firm, which has an aggregated fleet of 700 vehicles, is planning to expand its operations in terms of the fleet, people and new cities. Founded by Rakesh Munnanooru in 2016, the firm presently offers its services in Hyderabad, Chennai and Bengaluru.