Stone India Limited Churchgate, Mumbai, Maharashtra

Vigilance Control Device (VCD) is for monitoring alertness of engine crew through multi-resetting failsafe system which periodically gets reset by specified normal operational activities of the crew in addition to acknowledgement of vigilance check by operating foot pedal or ACK push switch during locomotive hauling. In case, driver becomes incapacitated, VCD initiates warning by flashing indication, sounding of buzzer and finally applies emergency brake to bring locomotive in stand still.

The VA-1B Control Valve proportions the amount of vacuum in the vacuum brake pipe to the air pressure in the compressed air brake pipe on the locomotive and acts as a pilot valve to operate the train vacuum brake, thus securing an application simultaneously with, and in proportion to the locomotive air brake application.

The va-1 release valve without choke is used as a remote controlled cut out cock. It is installed in the vacuum brake pipe line between the va-1b control valve and the train vacuum brake pipe.

Twin Tower Heatless Regenerating Type 'Vaporid' Air Dryers of WabtecUSA design are manufactured and supplied for continuous drying of incoming air for Electric and Diesel Loco Brake System. These dryers are very compact in design having the inbuilt after filter. These are light in weight, easy to install and it requires minimum down time as replacement of desiccant bags can be made in position. The potted Electronic control module ensures reliable operation of the dryer even in the adverse environment.

Tread Brake Unit type BF2S as per SAB-WABCO design is a very compact device integrating entire brake actuating mechanism for Railway vehicles comprising of Brake Cylinder, Levers for magnification of Braking efforts, Slack Adjuster to keep Cylinder stroke constant irrespective of Brake Shoe Wear and Brake Shoe Holder with twin Brake Blocks.

Brushless Alternators for Self-generating Coaches are manufactured for supplying the power to the Train Lighting for the conventional Coaches and also electrical load for Air Conditioned Coaches. The Alternators are presently being manufactured in capacities of 3 KW, 4.5 KW,18 KW and 25 KW both in 24 V and also 110 V DC. Alternators are driven by Pulleys (Flat Belt'V' Belt drive) which are also supplied as standard accessories along with Belt Tension Mechanism.

Brushless Alternators for Self-generating Coaches are manufactured for supplying the power to the Train Lighting for the conventional Coaches and also electrical load for Air Conditioned Coaches. The Alternators are presently being manufactured in capacities of 3 KW, 4.5 KW,18 KW and 25 KW both in 24 V and also 110 V DC. Alternators are driven by Pulleys (Flat Belt'V' Belt drive) which are also supplied as standard accessories along with Belt Tension Mechanism.

The Single Car Test Rig is a mobile unit with trolley arrangement & that can easily be transported to a single vehicle for testing the particular vehicle brake system. A large number of Stone India make Single Car Test Racks are being used for testing Wagon Brake System in Wagon Depots of Indian Railways

Sa-9 independent brake valve is a compact self lapping, pressure maintaining brake valve which is capable of graduating the application or release of locomotive air brakes independent of automatic brake. The sa-9 independent brake valve is also capable of releasing an automatic brake application on the locomotive without affecting the train brake application. The sa-9 brake valve has three positions : quick release, release and application.

The Parking Brake on Coaches and Car can be kept for a long time to protect the rolling stock without Air Pressure.

The Tri-Plate Panel Mounted Brake System is mainly made out of Aluminium alloy plates specially machined and then sandwiched. These are used for compact assembly of brake valves thus saving the space as well as reduction of large number of pneumatic fittings. This is modular in concept as well as maintenance friendly. Vacuum Console Panel is a compact unit housing the Vacuum Valves as well as the Filters and also a small panel comprising of other associated Valves related to Vacuum Brake System in the Locomotive. This eliminates dispersed fitment of Vacuum Valves in the Locomotive Brake System thus eliminating leakages as well as saving of space in the Locomotive.

The N-1 Reducing Valve reduces the pressure of compressed air supply to a constant predetermined value and delivers the same usually for operation of auxiliary devices.

The MU-2B Valve is a manually operated, two position and multi-ported valve arranged with a pipe bracket and is normally used for locomotive brake equipment for multiple unit service between locomotives equipped with similar system in conjunction with F-1 Selector Valve.

The Auto Drain Valve automatically discharge precipited moisture from Reservoir with every operating cycle of control device as well as manual draining of moisture through operating by manual device.

Load Sensing device type VTA are manufactured as per SAB-WABCO design and also as per Stone India's own design. These are used for Freight Wagon Brake System application instead of manual empty load changeover devices to adjust brake cylinder pressure depending on the condition of the Wagons i.e. loaded or empty.

The HS-4 Control Air Valve delivers a regulated, uniform, predetermined air pressure, which usually serves to regulate the operation of another device in the brake System.

The HB-5 relay Air Valve is a pneumatic, double piloted, three way valve that changes the air passages through it when air pressure of a predetermined amount or more is in the control chamber.

The H-5 relay air valve is an air operated three way valve that changes the air passage through it when the control air pressure is vented to atmosphere.

The F-1 Selector Valve performs the function of commanding the brake equipment on the locomotive to lead or trail position of the adjacent locomotive and ensures operation of brakes in the trail locomotives when initiated from the lead locomotive.

The ERRU 4.5 kW used in Indian Railway AC, non AC coaches receives the 3-phase AC voltage generated from a brushless alternator. The output of the alternator is AC in nature with variable voltage and variable frequency depending on the motion of the train. This AC voltage is rectified and passed through the controller to generate regulated DC voltage as required for AC and non AC coaches. It also charges a battery bank through a voltage and current controller.

The ERRU 25 kW used in Indian Railway AC, non AC coaches receives the 3-phase AC voltage generated from a brushless alternator. The output of the alternator is AC in nature with variable voltage and variable frequency depending on the motion of the train. This AC voltage is rectified and passed through the controller to generate regulated DC voltage as required for AC and non AC coaches. It also charges a battery bank through a voltage and current controller.

The electro pneumatic brake system consists of an electrically controlled air brake for normal service use giving extremely sensitive and rapid application of the brakes, together with well known automatic air brake providing a “ stand by” brake to be used for normal service stops, if required. The Automatic brake also provides for emergency application of the brake initiated by the driver, the guard, or by a breakaway. Self lapping E.P. brake can be graduated in application and release. Standby self lapping automatic air brake has graduated application and direct release feature. The brake system is suitable for EMU cars operating in multiple. Modular Panel design eliminates piping & complicated casting, easily retrofitted in existing EMU coaches.

Piston type duplex check valves are generally used in Railway Compressed Air Brake systems to prevent excessive use of auxiliary equipment from depleting the main compressed air supply to the detriment of the brake equipment

The D-24 B Feed Valve is a large capacity highly sensitive relay valve which is designed to direct the flow of air under pressure to various devices in air brake equipment arrangement at a predetermined pressure.