The Heavy Vehicles Factory (HVF), Avadi, is located in proximity to Chennai, Tamil Nadu, India. HVF was set up in the year 1965 when the Government of India decided to manufacture heavy battlefield equipments, including Vijayanta Tank and T-72s. Currently, HVF also produces military vehicles, including India's main battle tank the Arjun and the T-90's.

A heavy rescue vehicle, often referred to as a rescue company, rescue squad, heavy rescue, or simply, fire engine is a type of specialty firefighting or EMS (Emergency Medical Services) apparatus. Essentially oversized toolboxes on wheels, they are primarily designed for technical rescue situations such as auto accidents, rope rescues, swiftwater rescues, or collapses ^[1]. On the fireground, rescue squads may be responsible for truck company operations (such as structure ventilation, ladder operations, or Rapid Intervention Team operations) or search and rescue. They carry an array of special equipment such as the Jaws of life, wooden cribbing, generators, winches, hi-lift jacks, cutting torches, saws and many other powerful and destructive tools.

NFPA (National Fire Protection Association in the U.S.) regulation 1006 and 1670 give guidelines and regulations for the operation of heavy rescue vehicles and also state that all "rescuers" must have medical training to perform any technical rescue operation, including cutting the vehicle itself ^[2][3]. Therefore, in most all rescue environments, whether it is an EMS Department or Fire Department that runs the rescue, the actual rescuers who cut the vehicle and run the extrication scene are Medical First Responders, Emergency Medical Technicians, or Paramedics, as a motor vehicle accident has a patient involved.

In addition to fire brigades and rescue departments, e.g. tram or railway companies may have their own heavy rescue squads specialized to tram or train accidents ^[4][5]. For example, railway rescue squads may carry very specialized equipment for railway accidents like hydraulic jacks with a lifting capacity of 160 metric tons (approx. 176 short tons or 353,000 pounds) - or even more, equipment for moving locomotives horizontally, and equipment for tank car accidents ^[6].

Rescue squads can also carry the necessary equipment to respond to and deal with Haz-Mat incidents. These types of apparatus may also be equipped with a pump and tank(s) for water and/or foam, but at least they carry materials for decontamination, absorption of chemicals, blocking up a leakage, and protective suits for firefighters