Metro Bogie Frame: Cast Steel Core Structure with Modular Design for Urban Rail Transit

Overview of Metro Bogie

The metro bogie frame is the core structural framework of the bogie, known as the “backbone of the bogie.” It carries out the crucial functions of supporting the vehicle body, transmitting loads in all directions, and mounting key components such as the suspension system and drive unit. Its design directly impacts the bogie’s overall performance, operational stability, and service life, making it a technology-intensive and safety-critical component of metro vehicles.

This metro bogie frame utilizes a modular and lightweight design, combining cast steel materials with intelligent technology. It is suitable for different vehicle types (A, B, and L) and operating environments (mainline, urban, and cold/hot regions), meeting the operational demands of high loads, high frequency, and long service life.

Parameter Details of Metro Bogie

Parameters	Detailed Specifications
Applicable Vehicles	Metro A/B Type, Urban Express, Light Rail, etc.
Wheelbase	2200mm (standard) / 2500mm (wide wheelbase)
Frame Weight	Approximately 4.5t (excluding motor and brake system, cast steel)
Material	Main Structure: High-strength cast steel (ZG25MnNi, compliant with EN13104) Key Connections: Partially thickened cast steel
Surface Treatment	Electrophoretic Coating + Dacromet Anti-Corrosion Coating
Static Strength	Meets EN12663, Vertical Load ≥ 320kN, Transverse Load ≥ 160kN
Fatigue Strength	Passes 5 million equivalent load cycles (UIC 515 compliant)
Environmental Adaptability	-25°C to +50°C (Extended to -40°C to +60°C)

Features of Metro Bogie

Lightweight and High Strength

• The main structure utilizes ZG25MnNi high-strength cast steel, achieving an 18% weight reduction through topology optimization, while meeting the static and fatigue strength requirements of the EN12663 standard.
• Key connection areas (such as the motor mount and brake hanger) feature locally thickened cast steel to improve local load-bearing capacity and avoid stress concentration.

Modular Design

• The frame is divided into three modules: side sills, cross sills, and longitudinal connecting beams. This allows for quick assembly and disassembly and component replacement, reducing maintenance complexity and costs.
• Reserved mounting interfaces for the motor, brake, and suspension system adapt to different vehicle models and powertrain configurations.

Intelligent Monitoring Integration

• Fiber Bragg grating sensors are embedded in key stress areas of the frame (such as the junctions between the side sills and cross sills) to monitor stress and temperature in real time, supporting predictive maintenance.
• A reserved wireless transmission module interface enables integration with the Vehicle Health Management (PHM) system for remote status monitoring.

Redundant Safety Design

• The structural structure adheres to the principle of “no catastrophic consequences from a single point of failure.” Key connections feature a dual-redundancy design to ensure structural integrity under extreme operating conditions.
• It has passed the EU EN13749 crash safety certification and has a 15 km/h collision energy absorption capacity.

Environmental Protection and Corrosion Resistance

• The surface utilizes an electrophoretic coating and a Dacromet anti-corrosion coating, achieving a salt spray test corrosion resistance rating of ≥ 9 (ISO 9227), suitable for coastal and high-humidity environments.
• The material recyclability is ≥ 90%, complying with the EU ELV directive.

Application Scenarios of Metro Bogie

Urban Rail Transit

Adaptable to high-density subway lines (minimum headway of 90 seconds), the frame fatigue strength design meets the requirements of 20 hours of daily operation.

Intercity Railway

The wide wheelbase frame (2500mm) supports speeds of 120 km/h, meeting the dynamic load requirements of rapid commuter networks from suburban areas to the city center.

Special Environment Lines

The cold-wet-type frame (-40°C cold start) utilizes low-temperature cast steel to avoid the risk of low-temperature brittle fracture.
The hot-wet-type frame is certified for C5-M corrosion resistance and is suitable for use on coastal/tropical routes.

Multimodal Transportation

By adjusting the wheelbase and interface design, it is compatible with new bogie types such as monorail and rubber-tyred rail (custom frame module development required).

Package of Metro Bogie

Polybag + Carton box+ Wooden case/Pallet, according to customer’s request

Company Profile

Luoyang Fonyo Heavy Industries Co., Ltd. was founded in 1998, covers an area of 72,600㎡, with more than 300 employees, 32 technicians, including 5 senior engineers, 11 assistant engineers, and 16 technicians. It has been rated as Luoyang Engineering Technology Center, Luoyang Technology R&D Center, and National High-tech Enterprise for many times.
Our production capacity is 30,000 tons per year. Currently, we mainly produce cast steel, cast iron (gray iron, ductile iron, etc.), processing of finished product and component assembly for locomotive, railcar, high-speed trains, mining equipment, wind power, etc. Our products have been exported to Russia, the United States, Germany, Argentina, Japan, France, South Africa, Italy and other countries.

FAQS

Q1: Are you a manufacturer or trading company?
A: We are a manufacturer. Our company was founded in 1998, with nearly 30 years in casting industry, a total area of 72,600㎡, with a factory building area of 51,000㎡.
Q2. What are your main products?
A: We primarily focus on steel casting, iron casting, finished product machining, and component assembly production for locomotive, railcar, high-speed trains, mining equipment, wind power, etc.
Q3: How precision can you produce casting parts?
A: We have the capability of producing casting parts with different casting processes. The production is strictly comply with ISO 9001, ISO 14001 and ISO45001,EN15085, IRIS.
Q4. Can you produce according to the samples?
 Yes, we can produce by your samples or technical drawings. We can build drawings for you after we get your samples too.
Q5: How do you do Quality Control before delivery?
A: Quality inspection is a very important factor to guarantee the quality of steel casting parts. We follow 3 times of inspection during the whole production process. And we will provide material testing report, dimensional testing report, and mechanical properties testing report to our clients before delivery.

It you are interested in any products, please feel free to contact us.
Contact: Stella Liu
Email:sales@railwaypart.com
WhatsApp: +86-155-1535-1287