Yes, an interesting UK/USA difference here. Always a bus "timetable" in the UK, but often called a "schedule" in the United States. Similarly, a child's school timetable in the UK is often called a class schedule in the United States.

a timetable is usually a paper document that shows the scheduled times of public transportation, like a bus, train or ferry. Usually they are shown in a chart form. They are also called schedules. The two words aren't interchangeable (at least in the States) is when we talk about our daily schedule; work schedule, school schedule, weekly schedule, etc. I hope it helps.