TCRP report 155 provides guidelines and descriptions for the design of various common types of light rail transit (LRT) track. The track structure types include ballasted track, direct fixation ("ballastless") track, and embedded track. The report considers the characteristics and interfaces of vehicle wheels and rail, tracks and wheel gauges, rail sections, alignments, speeds, and track moduli. The report includes chapters on vehicles, alignment, track structures, track components, special track work, aerial structures/bridges, corrosion control, noise and vibration, signals, traction power, and the integration of LRT track into urban streets.

The Federal Railroad Administration's (FRA) rail-safety oversight framework relies on inspections to ensure railroads comply with federal safety regulations. FRA inspects railroad infrastructure and operations, identifies safety defects, and may, if warranted, cite the railroads for violations of federal safety regulations. This book examines the overall framework that FRA, the states, and the railroads use to ensure rail safety; the extent to which FRA and the railroads assess safety risks and allocate resources to address those risks; and what challenges, if any, exist to FRA's current safety framework, and what ongoing and emerging issues FRA faces.

Policymakers and program managers are continually seeking ways to improve accountability in achieving an entity's mission. A key factor in improving accountability in achieving an entity's mission is to implement an effective internal control system. An effective internal control system helps an entity adapt to shifting environments, evolving demands, changing risks, and new priorities. As programs change and entities strive to improve operational processes and implement new technology, management continually evaluates its internal control system so that it is effective and updated when necessary. Section 3512 (c) and (d) of Title 31 of the United States Code (commonly known as the Federal Managers' Financial Integrity Act (FMFIA)) requires the Comptroller General to issue standards for internal control in the federal government.