Abstract: A system and method are provided for determining a position of a vehicle traversing a constrained path via cooperating communications equipment installed at fixed points along a known route and onboard the vehicle. The disclosed schemes leverage certain commonly-installed communications nodes to provide positioning information for participating vehicles when those vehicles are specifically limited in their movement to a particular path, including a train track. Signal analysis between cooperating nodes provides localization information, including timing information, that is sufficient, given the physical constraints of the participating vehicles to a particular track, lane or the like, to quickly resolve a positional localization for the vehicles.