Exceptionally high tractive effort
In the freight transport sector, locomotives are often required to operate at the upper limit of their tractive capacity. Vectron’s tractive effort concentrates Siemens’ entire accumulated technical experience with locomotives. It allows the physically available coefficient of friction to be utilized extremely effectively, and is the result of continuous improvements to the wheel-slip prevention system. This high level of performance is the basis for all normal traction functions. Any locomotive that can operate reliably at the upper limit of its tractive capacity will have no difficulty with less challenging requirements.
The beginnings: U.S. coal transport in the 1990s
Siemens’ exceptional experience with locomotive traction has its origin in the locomotives developed jointly with EMD for heavy coal transport in North America. In the early 1990s, prototypes of the class SD60MAC demonstrated the feasibility of deploying only three instead of five locomotives with the same hauled load. This opened the door for the introduction of three-phase technology in North America. Over the following years, our knowledge base was broadened by a steady flow of new applications with a variety of different operating constraints. Today we can look back on more than 20 years of experience, which has naturally been incorporated into our latest products.
References: Highest utilization of tractive effort worldwide
Siemens locomotives achieve top performances in terms of tractive effort on a daily basis. This is verified by references from around the world. There are currently more than 4,000 locomotives with a Siemens wheel-slip prevention system in service.
Theoretical background: Slip and slide protection
Over the course of the years, Siemens has continuously adapted wheel slip and slide prevention using various systems and technologies. The most important terms and technologies are explained in the theoretical background.
Application example: Heavy-duty locomotives in Australia
Locomotives can also be retrofitted to increase utilization of tractive effort. The example of Australian heavy-duty locomotives that have undergone traction equipment refurbishment shows exactly what can be achieved. Today, three refurbished locomotives can fulfill the same task as five original locomotives.