Overhead Catenary (Contact) Lines

Overhead Catenary Lines is a multidisciplinary engineering system. Several engineering practices should be taken into account whereas a design, construction and operation of the OCS is the challenge. If it is split into some interconnected areas, that will be following areas:


- Geometrical requirements and coordination

- Environmental requirements and service conditions 

- Mechanical requirements and properties 

- Electrical requirements and properties

- Structural requirements and properties

- EMS and RAMS requirements 

Every thing in a perfectly operable OHL should lead to a solid dynamic and static electrical contact between the carbon strips of the pantograph and button of the contact wires throughout entire network. This crucial requirement obligates some study to be done based on system dynamic modeling and stability analysis.    

OHL (OCS) Engineering

​> Business development for rail projects

> Technical Support for Biding and Tendering

> Dynamic Modeling and Profile Analysis

> Insulation Coordination Study and Analysis

​> Conductor Current Gradient Analysis

> Short Circuit Study

> Loading and Stability Analysis

> Layout and Cross section Design

> RC and BT design

> Foundation and Cantilever Arrangement 

> Equipment Specification and Sizing

> System requirement management  

> Procurement Support


Project Management

> Engineering Design Management 

> Design Review and Report

​> Quality Assurance

> Construction Support

> Site Inspection and Audit

> H&S Test and Commissioning 

> Asset and maintenance management 

> OHL Operation Assessment

> Presentation and Documentation

> Training and Mentoring  


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Implementing an Overhead Catenary System Project

There is a master flowchart was issued to indicate the processes and functions algorithm for implementing a typical overhead line project from the beginning up to the end. Each box of the flowchart can be a milestone or a general WBS and should be developed separately. It means there are some other detailed flowcharts and algorithm for each box.

Click on the following link to see the flowchart:   

>> Overhead Catenary System , Flowchart of Project Implementation        

Integrating Traction Power Substations with OHL (OCS)

A traction power supply feeds the overhead catenery lines (OHL) via several traction substations. Circuitry and specifications of the OHL system are determining inputs during the design of the TPS. Conversely, some parameters from TPS has great influence on the OHL design and construction. Therefore, integration management and interface considerations are parts of the consolidated design and construction for an interconnected rail electrification.  

>> Integration management for traction Power Supply and OHL

​# Trolley type Bus Overhead lines at the inter section. Additional components are required to implement an operable design with minimum future maintenance requirements. 

Asset Management for Overhead Catenary Lines Asset

Similar to the Traction Power Supply Infrastructure, Overhead Lines are also very expensive and complex asset. There are heaps of individual components throughout the entire electrified railway network which can create a serious problem for a long section of the network if one of them fails. Management of such a asset needs to address several strategies at the same time.

Technical Knowledge and Understanding of the OHL system combined with some standard asset management methods will offer reliable and stable solutions to reduce failure, shutdown, costs and ultimately uncertainty.       

(to be continued)        

  Integrating the accomplishments