At a glance
• Sécheron has successfully modernized traction power substations in La Chaux-de-Fonds, bringing infrastructure back to life after more than a decade out of service to allow TransN to launch its new trolleybus driver training program.
• Through over 1,500 hours of intensive engineering research, Sécheron integrated advanced equipment – including SEPCOS protection and control units – to ensure full compatibility with TransN’s centralized remote control system.
1,500+ Hours
of intensive research and study invested by Sécheron experts to guarantee compatibility
10+ Years
of network disconnection before this major modernization project revived the substations
1949
is the historic year trolleybuses were first introduced to the La Chaux-de-Fonds region
A historic revival for regional transit
The eco-friendly rumble of trolleybuses is officially returning to the streets of La Chaux-de-Fonds. First introduced to the region in 1949, this sustainable mode of transport has deep roots in the community, with Sécheron supporting the network’s traction power substations since the 1990s.
Following a decision that left the network disconnected and out of service for over ten years, a major modernization project carried out this year has successfully brought the infrastructure back to life. This revival marks a crucial milestone, directly enabling TransN to launch its official training program for the drivers of the brand-new trolleybus fleet.
Photo credit: TransN
Overcoming the remote control challenge
Bringing a dormant power network into the modern era required solving a sophisticated technical puzzle. The primary engineering challenge centered on upgrading the legacy substations to make them fully compatible with TransN’s contemporary centralized remote control system.
To bridge the gap between historical infrastructure and modern digital management, Sécheron’s engineering team invested more than 1,500 hours of intensive research and specialized audits, ensuring the proposed solutions met every strict operational and safety requirement.
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Advanced SEPCOS technology in the landscape
To achieve this seamless integration, Sécheron deployed a suite of latest-generation equipment designed for maximum reliability and safety. Central to this modernization is the installation of SEPCOS protection and control units, alongside our isolated amplifiers for current measurement (ESTRA-MIU) and voltage measurement (ESTRA-VM). These technologies upgrade the intelligence of the substations, allowing for real-time monitoring and robust control. By blending reliable legacy infrastructure with cutting-edge digital protection, the upgraded substations now deliver the stable and resilient power distribution necessary to support daily network operations.
