Trains are equipped with emergency stop buttons, door release levers, intercoms and fire extinguishers. Modern doorbells often incorporate intercoms and miniature video cameras to increase security. The company specialized in electrical devices including telephones, intercoms, and fire alarm systems. The trains feature automatic train control, air conditioning, emergency intercoms, wheelchair spaces and emergency braking. The trains featured air conditioning, emergency intercoms, wheelchair spaces and automated announcements. These intercoms usually appear as circuits on communications consoles in dispatching centers. Drive-through systems are often enhanced by the use of drive-through wireless (or headset) intercoms. Pneumatic intercoms can be applied to motorcycle helmets for pilot-passenger communication. Trains are equipped with intercoms to allow passengers to communicate with staff during emergencies. Portable intercoms are commonly used by special event production crews and professional sports teams. I've got these wireless intercoms from the '50s from an auction from a dentist's office. There are simple house intercoms and intercoms developed for collective apartments. The company started out manufacturing apartment intercoms in Toronto. In "Sound Holes" (2007), he photographed the many patterns of speaker holes on intercoms. Each seating is announced over the intercoms in each car, and in each sleeping compartment.