Miller Ingenuity Wins California Contracts for ZoneGuard Electronic RWP System


The safety system will be deployed at San Diego Trolley, MUNI, and with a San Francisco contractor.

Winona, MN – Miller Ingenuity was recently selected to supply ZoneGuard, their electronic roadway worker protection system, to two California transit agencies, San Diego Trolley and San Francisco Municipal Railway (MUNI). Additionally, ZoneGuard has been deployed on a track rebuild project in Lafayette, CA, by a general engineering contractor based out of the San Francisco Bay Area to warn track workers and equipment operators of trains approaching on adjacent tracks.

Each customer chose to purchase Miller’s ZoneGuard portable system kits which includes train detector modules, train alert modules, and worker wearable devices. The portable kit is engineered to be lightweight, weighing under 5lbs and measuring about a foot in length, and flexible enough to easily set up and transport to multiple job sites.

This fall, California transit agencies are required to comply with roadway worker protection rules defined in General Order NO. 175-A. One of those rules requires agencies to adopt “early warning alarm technology” to coincide with their existing protection procedures. With the purchase of ZoneGuard, San Diego Trolley and MUNI have fulfilled this requirement from the state.

“These contracts are not only a great moment for our ZoneGuard team, but they are also a great win for roadway workers in California,” said Kevin Smith, Senior Vice President Global Sales and Marketing. “Our electronic RWP system has patented detection technologies that work together to form a secure zone of protection for workers out in the field. That unique technology paired with our worker wearable devices, provides rail maintenance crews with the ability to put the responsibility of safety back into their own hands.”

ZoneGuard’s train detection modules (TDMs) and train alert modules (TAMs) form a communication network that detects track vehicles entering an active work zone. Once detected, the system sends a signal to each worker’s wearable device. ZoneGuard’s technology allows it to be flexible for every customer’s unique environment and works within high-noise urban environments, under high-power lines, through tunnels, on bridges, around curves, and across multiple tracks. The ZoneGuard fixed system is currently installed on 30-miles of Maryland MTA’s light rail line.

Miller Ingenuity, a manufacturing company based in Winona, MN, is a global supplier of lifesaving, high-technology safety systems and services that surpass rail-safety standards. For more than 65 years, the organization has demonstrated the ability to conceptualize, design, produce and deliver railroad parts that meet the current and emerging needs of the industry. For more information, visit

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