Our Products #3733098

Prag AES-APU [Automatic Engine Shutdown and Auxiliary Power Unit] system is designed to provide substantial fuel saving and reduce emissions of Diesel-Electric Locomotives by automatically shutting-down of main locomotive engine on idling along with continuous monitoring of critical parameters.

The system includes a small diesel engine coupled with a low capacity compressor and alternator that perform the function of maintaining main reservoir air pressure and keeping the locomotive batteries charged while the main engine is shutdown. The equipment is supplied complete with controls, sensors, accessories, and application software.

It is estimated that by preventing unwanted locomotive idling the Prag AES-APU would provide fuel saving of up to 150 200 Litres per locomotive per day, which translates to more than US$ 30, 000 per locomotive per annum in addition to reducing idling emissions by more than 25%.

Prag designs and manufactures a range of equipment used for supply and treatment of compressed air for Railroad Air Brake Systems. These include Heatless Air Dryers, Auto-Drain Valves, Feed Valves, Coalescer Filters and Main Reservoir Filters.

Amongst our most notable innovations is the Prag AquacheckTMHeatless Regenerative Air Dryer System. This vibration-resistant, compact and lightweight Air Dryer is designed to remove moisture and oil aerosols from compressed air and ensure continuous supply of clean and dry air to the air brake system.

Prag offers five different Aquacheckmodels catering to a wide range of rolling stock. The system is in active service on over 1, 000 locomotives. Optional heaters can be provided wherever required for operation in sub-zero ambient conditions.

The Prag Aquacheckdesign was provided to the Indian Railways on Technology Transfer basis in 2003 and has been adopted by them as a standard on their Diesel & Electric Locomotive Fleet as well as on EMU & DEMUs.

Unique parallelogram design brake system is manufactured under the license of and transfer-of-technology from M/s Knorr Bremse India Pvt. Ltd. This highly reliable design is AAR approved and is designed to minimize weight and deliver optimum braking performance, which results in uniform shoe and wheel wear. Over 5, 000 freight wagons fitted with Prag Air Brake System are in active service in the Indian Railways.

The brake cylinders are equipped with integral double-acting slack adjusters, which maintain constant piston stroke, resulting in uniform and efficient braking performance.

A Load Sensing Device [EL-60] UIC approved design senses loaded or empty conditions of the freight wagons, and provides a visual indicator showing brake cylinder pressure proportioning, and also sends out pneumatic signals which govern the magnitude of braking forces. This helps protect the wheels by reducing empty-car braking forces that can result in costly wheel skidding, especially under adverse weather or track conditions.

Prags range of Locomotive Draft Gears include both Rubber as well as Polymer based Draft Gears with Yoke Assemblies and are built to perform continuously in the harshest of operating and environmental conditions.

PAC and MAC Draft Gears with laminated-rubber spring elements, designed for use on EMD locomotives, are engineered to perform in the heaviest of traction applications and offer adequate protection in draw as well as buff modes while absorbing huge amounts of energy.

The DG70N Draft Gear is a Non-Friction Heavy Duty Soft Draft Gear designed for use in Alco & Electric Locomotives. It is fitted with a 70 kJ PolspaPolymer Spring Pack, offering years of maintenance-free performance and ensuring much superior riding comfort and safety, as compared to rubber-spring based draft gears.

Prag was amongst the first to develop a completely indigenous Plate Heat Exchanger for Locomotive applications with the introduction of PHE-01 Plate Type Lube Oil Cooler in 2004.

Designed to offer the most optimum thermodynamic performance, the PHE-01 heat exchanger has been in use on several Diesel-Electric Locomotives in India for more than 10 years.

Heat transfer SS plates and Rubber Gaskets used in Prag PHE-01 are manufactured on fully automatic presses in accordance with the highest quality standards. Our team is well equipped to develop custom-designed Plate Heat Exchangers as per specific customer requirements.

Our range of mechanical filtration systems includes the SpinfloTM Self-Cleaning Inertial Air Filtration System used in engine air intake filtration and Centrifugal Cleaners used in locomotive lube oil filtration.
Spinflo filters consist of an array of spin-tubes designed to check tough contaminants including soot, rain, snow and sawdust while offering minimal resistance to the flow of air. It is the only fully indigenous inertial air filtration system for use in railroad applications, removing up to 98% contaminants at the primary filtration stage itself.The Centrifugal Lube-Oil Cleaner is a fit-and-forget mechanical lube-oil filtration system developed indigenously for the first time by Prag. Today, the system is installed in more than 3, 000 locomotives and has led to effectively doubling the life of media-based lube-oil filters in addition to extending the lube-oil service life.

Rubber moulding and Rubber-metal bonding has been Prags forte since the very beginning. Today, range of rubber products offered is amongst the most extensive in the industry and caters to Oilfield, Industrial, Automotive and Railroad applications.
Our energy management rubber products include a range of rubber buffer, draft gear and side bearer springs for use on locomotives, passenger cars and freight wagons. We also manufacture a range of shear pads, compression mounts, spherical bearings, rubber springs, and bushes for use in EMD Locomotive and LHB Fiat Bogie suspension.

Rubber moulding and Rubber-metal bonding has been Prags forte since the very beginning. Today, range of rubber products offered is amongst the most extensive in the industry and caters to Oilfield, Industrial, Automotive and Railroad applications.
Our energy management rubber products include a range of rubber buffer, draft gear and side bearer springs for use on locomotives, passenger cars and freight wagons. We also manufacture a range of shear pads, compression mounts, spherical bearings, rubber springs, and bushes for use in EMD Locomotive and LHB Fiat Bogie suspension.

Draft Gears include both Rubber as well as Polymer based Draft Gears with Yoke Assemblies and are built to perform continuously in the harshest of operating and environmental conditions.PAC and MAC Draft Gears with laminated-rubber spring elements, designed for use on EMD locomotives, are engineered to perform in the heaviest of traction applications and offer adequate protection in draw as well as buff modes while absorbing huge amounts of energy.
The DG70N Draft Gear is a Non-Friction Heavy Duty Soft Draft Gear designed for use in Alco & Electric Locomotives. It is fitted with a 70 kJ PolspaTM Polymer Spring Pack, offering years of maintenance-free performance and ensuring much superior riding comfort and safety, as compared to rubber-spring based draft gears.

Our range of mechanical filtration systems includes the SpinfloTM Self-Cleaning Inertial Air Filtration System used in engine air intake filtration and Centrifugal Cleaners used in locomotive lube oil filtration.Spinflo filters consist of an array of spin-tubes designed to check tough contaminants including soot, rain, snow and sawdust while offering minimal resistance to the flow of air. It is the only fully indigenous inertial air filtration system for use in railroad applications, removing up to 98% contaminants at the primary filtration stage itself.The Centrifugal Lube-Oil Cleaner is a fit-and-forget mechanical lube-oil filtration system developed indigenously for the first time by Prag. Today, the system is installed in more than 3, 000 locomotives and has led to effectively doubling the life of media-based lube-oil filters in addition to extending the lube-oil service life.

The brake cylinders are equipped with integral double-acting slack adjusters, which maintain constant piston stroke, resulting in uniform and efficient braking performance.A Load Sensing Device [EL-60] UIC approved design senses loaded or empty conditions of the freight wagons, and provides a visual indicator showing brake cylinder pressure proportioning, and also sends out pneumatic signals which govern the magnitude of braking forces. This helps protect the wheels by reducing empty-car braking forces that can result in costly wheel skidding, especially under adverse weather or track conditions.