PolicyBrief
H.R. 3729
119th CongressJun 4th 2025
Battery and Regenerative Braking Act
IN COMMITTEE

This Act expands eligibility for federal rail infrastructure funding to allow commuter rail providers to apply for money specifically for regenerative braking and energy storage system projects.

Kevin Mullin
D

Kevin Mullin

Representative

CA-15

LEGISLATION

Commuter Rail Gets Green Light for Federal Funding on Energy-Saving Tech

The newly introduced Battery and Regenerative Braking Act is short, sweet, and focused on making commuter trains much more energy-efficient. Essentially, it’s a procedural tweak to an existing federal rail funding program, but the real-world impact is about modernizing the trains you ride every day.

The Upgrade: Funding for Greener Trains

This Act amends Section 22907 of Title 49, U.S. Code, which governs the Consolidated Rail Infrastructure and Safety Improvements program. Previously, this program funded things like track maintenance and safety upgrades. The big change here is that any entity providing commuter rail passenger transportation—that’s your local regional train service—is now explicitly eligible to apply for these federal dollars. Crucially, the bill specifies that these funds must be used for projects that develop and implement regenerative braking systems and energy storage technologies (Sec. 2).

What Does Regenerative Braking Mean for You?

Think about your hybrid car: when you slow down, the energy that would normally be lost as heat through friction (and wasted) is captured and sent back to the battery. That’s regenerative braking. Applying this to a heavy commuter train is a massive deal. A train slowing down to enter a station generates huge amounts of kinetic energy. This bill allows commuter rail agencies to apply for federal funding to install the tech needed to capture that energy and reuse it to power the train or the station. For the average rider, this means the system becomes more sustainable, which can translate into more stable operating costs over time.

The Real-World Impact: Efficiency and Modernization

This legislation is a direct incentive for modernization. It takes the guesswork out of funding these expensive, high-tech upgrades. Before this Act, a commuter rail agency might have struggled to justify using general infrastructure funds for a specialized battery system. Now, they have a clear path to federal money specifically earmarked for this purpose. This is good news for the environment, as it reduces the overall energy draw of the rail system, and it's good news for riders, as it pushes the rail system toward modern efficiency standards. It’s essentially the government saying, “We’ll help pay for the fancy batteries and smart brakes if you promise to make your trains greener.” Since this only expands eligibility for existing funds and targets a clear technological upgrade, it’s a win-win for efficiency and infrastructure.