The first vehicle called a bus was a horse-drawn carriage, consisting of wood, iron, steel and rubber. The first mass-produced bus was the London General Omnibus Company's B-type, an engine-powered vehicle that used wood and steel in its construction.
The first bus was constructed like most horse-drawn carriages. The carriage's frame and undergear primarily consisted of steel and iron. However, the wheels were made of a strong variety of wood, such as ash. The wheel's spokes were bolted to a steel hub, and the wheel's fellow, its outer circle, is lined with rubber. Finally, a harness was needed for the horse to move the bus; the harnesses were usually made of rope and leather at the time.
While some steam-powered and trolley buses appeared sporadically during the 19th century, the first mass-produced vehicle that resembles the modern bus was the B-type, introduced to London in 1910. The B-type had a wooden frame, steel wheels lined with rubber, a chain gearbox and a four-cylinder engine. B-type buses had interior seating as well as an open-air upper deck. Electric lighting was later introduced so the buses could operate at night. Because of their sturdiness, B-types were later outfitted with anti-aircraft guns and carrier pigeon homes during World War I.