Here’s some more info from the US Dept of Labor website about training for a bus driver:
Education and training. Some employers prefer high school graduates and require a written test of ability to follow complex bus schedules, but the ability to drive and a clean license are usually more important.
Most companies give driver trainees 2 to 8 weeks of classroom and behind-the-wheel instruction. In the classroom, trainees learn Department of Transportation and company work rules, safety regulations, State and municipal driving regulations, and safe driving practices. They also learn to read schedules, determine fares, keep records, and deal courteously with passengers.
During training, all bus drivers practice driving on set courses. They practice turns and zigzag maneuvers, backing up, and driving in narrow lanes. Then, they drive in light traffic and, eventually, on congested highways and city streets. They also make trial runs without passengers to improve their driving skills and learn the routes. Local transit trainees memorize and drive each of the runs operating out of their assigned garage. New drivers make regularly scheduled trips with passengers, accompanied by an experienced driver who gives helpful tips, answers questions, and evaluates the new driver’s performance. Most bus drivers get brief supplemental training periodically to stay informed of safety issues and regulatory changes.