Extreme-Duty GOST Compliant
Coupler & Draft Gear Systems
High-strength CA-3 (SA-3) automatic couplers, forged yokes, and friction/elastomer draft gears designed for 1520mm gauge heavy-haul freight, tank cars, and locomotives operating in sub-zero environments.
Heavy-Duty Traction and Buffer Solutions
for 1520mm Gauge Rail Networks
Our GOST Standard Draft Gear System is specifically engineered to withstand the severe dynamic impacts, high payload loads, and extreme low-temperature conditions characteristic of 1520mm railway operations. Built to strict GOST standards, our SA-3/CA-3 coupling assemblies and energy-absorbing draft gears deliver uncompromised mechanical reliability and structural fatigue resistance.
Automatic Coupler Equipment
Governing standard for automatic coupler equipment for rolling stock.
Cast Steel SA-3 Components
Cast steel components for SA-3 couplers -- body, lock, and knuckle specifications.
Draft Gears -- Class T0 to T3
Draft gear classification for freight cars and locomotives covering T0, T1, T2, T3 classes.
Climatic Category UHL1
Certified for extreme cold climates -- operating range -60°C to +50°C.
Product Sub-Categories &
Technical Specifications
SA-3 / CA-3 Automatic Couplers & Forged Yokes
Interlocking automatic coupler head system with integrated lock mechanisms, uncoupling levers, and high-tensile cast/forged draft yokes (Yoke / Эокель) for heavy freight train operations.
| Component / Type | Breaking Strength | Proof Load | Temperature Range | Standard Compliance | Material Grade |
|---|---|---|---|---|---|
| Standard CA-3 | ≥ 2.5 MN | 1.5 MN | -50°C to +50°C | GOST 22703 / GOST 3475 | Cast Steel 20GL |
| Enhanced CA-3 | ≥ 3.0 MN | 1.8 MN | -60°C to +50°C | GOST 22703 / GOST 3475 | Alloy Steel 20GFL |
| GOST Coupler Yoke | ≥ 2.5 MN | 1.5 MN | -60°C to +50°C | GOST 22703 | Forged / Cast Steel |
Available Components & Spare Parts
GOST Energy-Absorbing Draft Gears ( Class T0, T1, T2, T3, P4, R-5P)
Absorbs longitudinal dynamic impacts during humping, switching, and braking operations. Available in friction-rubber, elastomer, and hydraulic-friction designs categorized by energy storage capacity under GOST 32913.
| Draft Gear Class | Energy Capacity | Buffer Stroke | Cushioning Type | Standard | Main Application |
|---|---|---|---|---|---|
| Class T0 | ≥ 20 - 30 kJ | 70 - 90 mm | Spring-Friction | GOST 32913 | General Freight |
| Class T1 | ≥ 50 kJ | 90 - 105 mm | Rubber-Friction | GOST 32913 | Heavy Freight |
| Class T2 | ≥ 70 - 90 kJ | 120 mm | Elastomer Block | GOST 32913 | Tank Cars / Hazardous |
| Class T3 | ≥ 130 - 140 kJ | 120 mm | Hydro-Friction | GOST 32913 | Heavy-Haul Tank / Ore |
| P4 / R-5P | Custom Heavy | 90 - 120 mm | Polymer / Elastomer | GOST / Industry Std | Locomotives / Special |
Maintenance-free high-capacity elastomer spring packages for reduced lifecycle cost.
Excellent energy absorption efficiency with minimum recoil force during impact events.
Cold Climate Toughness (UHL1)
& Inspection Rigor
Extreme Cold Resistance
Specially alloyed steel (20GL / 20GFL) with low-temperature impact toughness. Charpy V-notch verification at -60°C to ensure no brittle fracture in extreme winter environments.
Advanced NDT Inspection
100% Radiographic Testing (RT), Magnetic Particle Testing (MT), and Ultrasonic Testing (UT) on all critical casting sections and high-stress points.
Drop Impact & Static Tests
Verified under heavy falling weight test rigs simulating hump yard impact dynamics. Static compression loads up to 3000 kN.
Proven Operating Performance
in 1520mm Rail Gauge Region
Supplied and deployed for heavy industrial freight routes across CIS and Central Asian countries. Our GOST-compliant coupling and draft gear systems are in active service across some of the world's most demanding freight corridors.
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Heavy-Haul Freight -- Coal & Ore Hopper Wagons
High-tonnage open-top wagons demanding maximum coupler strength and draft gear energy absorption.
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Chemical & Petroleum Tank Wagons
Requiring Class T2 / T3 high-energy draft gear protection to prevent shell rupture during coupling impact.
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Mainline Freight Locomotives & Shunting Engines
P4 / R-5P series draft gears and enhanced CA-3 couplers for locomotive traction applications.
Active Deployment Regions
1520mm gauge network -- the world's second-largest rail gauge system, spanning over 200,000 km of track.
Technical Resources
Full GOST Draft Gear & CA-3 Coupler Spec Sheet
Request via inquiry form →
CA-3 Coupler Spare Parts & Dimensional CAD Drawings
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GOST Draft Gear Maintenance & Inspection Manual
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All technical documents are available upon request. Submit your inquiry below and our team will send the relevant materials within 1 business day.
Frequently Asked Questions
Are your CA-3 couplers and draft gears compliant with EAC / CU-TR certification?
Yes, our GOST standard couplers, knuckles, yokes, and draft gears are produced in strict compliance with GOST standards and can be supplied with complete material and quality certification necessary for CU-TR / EAC clearance. Contact us for specific documentation requirements for your procurement process.
Which draft gear class should be selected for Tank Cars carrying dangerous liquids?
According to GOST 32913, Class T2 (≥70-90 kJ) or Class T3 (≥130 kJ) elastomer/hydro-friction draft gears are required for tank cars transporting hazardous goods to prevent shell rupture during coupling impact.
Can your SA-3 couplers operate in low temperatures down to -60°C?
Yes. We use specialized 20GFL low-temperature alloy steel for coupler bodies and yokes under category UHL1 (GOST 15150) to ensure high impact toughness without brittle fracture in extreme cold winter environments. All components undergo Charpy V-notch impact testing at -60°C as part of our standard quality control process.
Request a Quote for
GOST Draft Gear Systems
Send us your requirements and we'll respond with availability, specifications, and pricing -- typically within 24 business hours.