The cable system in rail transit vehicles is not only responsible for power transmission and signal control, but also plays an important role in the vehicle safety system. In enclosed spaces with high vibration, temperature fluctuation, and complex electromagnetic environments, the stability of cable material performance directly affects the operational safety level of the train.
From the perspective of global standards, rail transit cables mainly follow two technical systems:
European system: EN50264 / EN50306 / EN45545
North American system: AAR-S-501 / RP-585 / IEEE1202
These two systems are based on different engineering priorities:
Europe: Passenger Safety、Fire Risk Control、Light Weight Design
North America: Mechanical Reliability、Long Service Life、Heavy-Duty Operation Adaptability
This difference is finally reflected in the performance requirements for cable materials used in rail transit vehicles.
EN50264 is a European railway vehicle cable system standard. It is widely used in metro systems, high-speed trains, and internal wiring systems of urban rail transit vehicles.
The standard covers voltage ratings from 300/500V up to 6kV. It is a typical vehicle-level cable specification rather than a single product standard.
Its main requirement comes from the EN45545 fire protection system. This means EN50264 is essentially part of the railway vehicle fire safety system, rather than only an electrical standard.
EN50264 requires cables to have excellent temperature resistance, strong mechanical performance, vibration resistance, and abrasion resistance. At the same time, the cables must also have excellent resistance to mineral oil, fuel oil, acids, and alkalis.
Therefore, railway vehicle cables produced according to the European EN50264 standard widely use low smoke halogen-free flame retardant polyolefin materials and thermoplastic elastomer materials. This system is commonly used in high-load areas such as the underside of railway vehicles and traction systems.
AAR-PR-585 belongs to the North American railway association standard system. It mainly serves heavy-haul freight railway locomotive traction systems, long-distance railway transportation systems, and some urban rail transit projects.
Different from the EN50264 system, its design is not centered on passenger density. Instead, its main goal is the long-term operational reliability of railway vehicles and adaptability to extreme mechanical environments.
IEEE1202 is used to evaluate the vertical burning behavior of bundled cables. Its main evaluation indicators include flame propagation height, burning duration, and self-extinguishing ability.
Different from EN45545, IEEE1202 pays more attention to whether the cable flame becomes uncontrollable during burning, rather than the toxicity level of smoke.
The material used in AAR-RP-585 is also irradiation crosslinked polyolefin compound. However, since the AAR-PR-585 standard must pass the FT4 bundled flame test requirement in IEEE1202, halogen-containing XLPO materials are commonly used.
This is different from EN50264, because the AAR-RP-585 standard does not require the material to be low smoke halogen-free.
The European standard system is mainly used for urban rail transit. It emphasizes passenger safety and fire control, while also optimizing weight and space utilization.
The North American standard system is more suitable for heavy-haul railways. It focuses on equipment life, mechanical reliability, flame retardancy, and long-term operational stability.
The European standard system mainly uses crosslinked polyolefin compound (XLPO) materials. It emphasizes LSZH systems, heat release control, fire safety, and oil resistance.
The North American standard system also uses irradiation crosslinked polyolefin materials as the core material, but it places more emphasis on abrasion resistance, oil resistance, flame retardancy, and mechanical fatigue resistance.
Cables under the EN50264 standard usually use thin-wall structures together with high-density wiring and lightweight design.
Cables under the AAR-PR-585 standard usually use thick-wall structures and must withstand higher mechanical strength and higher fire resistance requirements.
In the field of railway locomotive cables, although both the EN50264 system and the AAR-RP-585 system use irradiation crosslinked polyolefin materials, their flame retardant logic and fire safety goals are not the same.
In fact, if only bundled burning performance and flame propagation control are considered, the AAR-RP-585 / IEEE1202 system is usually stricter than EN50264. IEEE1202 (FT4) uses a high-power flame of 70,000 BTU/hr to conduct a 20-minute continuous flame test on bundled cables mounted on a vertical cable tray. The test scale, heat input, and tray loading conditions are all considered high-intensity industrial flame retardant testing.
Therefore, in terms of bundled burning scale, flame propagation control, vertical tray burning behavior, and self-extinguishing ability, IEEE1202 usually has higher requirements. This is also why many North American industrial cables can pass IEEE1202 or UL FT4 tests even if they do not meet the EN45545 system.
However, the core difference between EN50264 cable materials and AAR-RP-585 cable materials is not which one has a higher flame retardant level. The real difference is that they focus on completely different fire risk models.
EN50264 itself is a vehicle cable standard, while the EN45545 system is the real standard that defines fire safety requirements.
EN45545 does not only focus on whether the cable burns. It also focuses on whether smoke concentration affects passenger evacuation, whether toxic gas causes suffocation, whether heat release accelerates loss of control inside the carriage, whether visibility decreases quickly, and whether corrosive gases damage vehicle systems.
Therefore, the main goal of the European railway system is to reduce passenger casualties as much as possible when fire cannot be completely avoided.
Compared with the European system, the AAR-RP-585 / IEEE1202 system follows a more industrial railway logic. Its main goal is to prevent flames from spreading rapidly along the cable system.
Therefore, this system pays more attention to cable tray flame propagation, flame spread distance, mechanical integrity, and long-term reliability of railway vehicle cables.
Especially in heavy-haul railway locomotive systems, cable bundles are larger, oil contamination environments are more complex, equipment operation cycles are longer, and maintenance intervals are longer. Therefore, the AAR system usually requires cables to use thicker insulation structures together with stronger oil-resistant and abrasion-resistant designs.
This is one of the most misunderstood issues in the railway cable industry.
The reason is that EN45545 and IEEE1202 evaluate completely different dimensions.
| Standard | Core Objective | Key Focus |
| EN45545 | Passenger safety | Smoke toxicity, heat release, Low smoke and halogen-free |
| IEEE1202 | System-level flame retardancy | Flame propagation and cable tray combustion behavior |
Therefore:
Some industrial cables that meet IEEE 1202 standards may not meet EN 45545 toxicity requirements; similarly, some low-smoke halogen-free cables that meet EN 45545 standards may not easily pass the large-scale FT4 bundled combustion test.These are not simply a matter of "higher or lower," but rather two safety systems developed under different engineering objectives.
| Project | EN 50264 (Europe) | AAR-PR-585 (North America) |
| Standards System | EN 50306/50264 system | AAR + IEEE system |
| Core Objectives | Low smoke, halogen-free + system safety | Flame propagation control + strength reliability |
| Testing System | EN 45545 fire safety system | IEEE 1202 Combustion Test |
| Project | EN system | AAR system |
| Main Materials | LSZH XLPO compound | Low-halogen XLPO |
| Design Concept | Environmentally friendly, low smoke and low toxicity | Fire resistance, mechanical reliability |
| Structural Trends | Lightweight and thin-walled (EN50306) | Thicker walls, higher strength |
EN System: EN 45545 Fire Safety Rating, Smoke Density and Toxicity Testing, Oxygen Index Testing, Oil Resistance Testing.
AAR System: IEEE 1202 Flame Propagation Testing, Bundled Burning Behavior Assessment, Aging and Tensile Strength Testing, Oil Resistance Testing.
Q1: How should I choose cable materials for rail transit vehicles?
A1: Materials conforming to EN50264/EN50306/EN45545 are suitable for cables in rail transit vehicles such as metro systems, intercity high-speed rail, and light rail vehicles. Priority should be given to Angreen Inc low-smoke halogen-free flame-retardant cross-linked polyolefin materials.
Materials conforming to AAR-S-501/RP-585/IEEE1202 are suitable for cables in freight railways, locomotive systems, and international long-distance transport rail vehicles. Priority should be given to Angreen Inc low-smoke low-halogen flame-retardant cross-linked polyolefin materials.
Q2: What is the elongation of Angorei's XLPO material for rail transit locomotive cables conforming to AAR-S-501/RP-585/IEEE1202 standards?
A2: Angreen Inc XLPO materials conforming to AAR-S-501/RP-585/IEEE1202 standards have an elongation of >200%, and the elongation performance after aging also meets the requirement of >200%.
