Siemens Mobility, Inc. is the U.S. operating subsidiary of Germany's Siemens Mobility GmbH, which is itself a wholly owned, separately managed company of Siemens AG. The U.S. entity was incorporated in Delaware in late 2017 (registered in New York in 2018) and lists its headquarters at One Penn Plaza, New York, NY; its principal U.S. rail manufacturing and assembly site is in Sacramento, California. Its parent reported fiscal 2025 (ended September 30, 2025) revenue of €12.4 billion and roughly 43,400 employees worldwide; Siemens Mobility, Inc. is not separately publicly traded, and no standalone U.S. headcount or revenue figure is published.
The company supplies rail and road transportation technology. Core lines include rolling stock (high-speed, intercity, metro, light-rail and locomotive platforms), rail automation and signaling (electronic interlockings, ETCS/train-control onboard units, CBTC, axle counters, level-crossing and yard systems), rail electrification, turnkey transit systems, and digital/service offerings such as fleet monitoring and predictive maintenance. It is a large, established operating company, not a patent-assertion vehicle.
Its litigation posture is that of an operating company that is both a defendant and an active validity challenger. The single tracked district court case, Metrom Rail, LLC v. Siemens Mobility, Inc. et al. (D. Del., filed January 13, 2022), is an infringement suit against Siemens and co-defendants over ultra-wideband train-control and collision-avoidance patents. Siemens's two "plaintiff" appearances are not district court suits but PTAB petitions filed January 13, 2023 — Siemens Mobility, Inc. et al. v. Metrom Rail, LLC — seeking review of the asserted patents. The dispute is therefore two-way but clustered in the District of Delaware rather than a plaintiff-friendly Texas venue.
Context: the Metrom Rail dispute concerns UWB-based signaling technology tied to a New York MTA pilot and CBTC modernization, where Siemens is one of a small number of global suppliers of communications-based train control. Metrom Rail (Lakemoor, Illinois) is itself an operating rail-safety supplier asserting its own patents, not an NPE. The D. Del. case was stayed pending the parallel IPRs. Beyond these matters, no other patent cases involving this entity appear in the tracked data.