Brake linings are composed of a relatively soft but tough and heat-resistant material with a high coefficient of dynamic friction. Brake linings are attached to the brake shoe either by riveting or bonding. The complete assembly is then often called a brake pad or brake shoe. The brake linings may be organic, semi-metallic, metallic, or synthetic. Organic brake linings are made from non-metallic fibers bonded together to form a composite material. Organic brake linings contain friction modifiers that may include graphite and powdered metals. Cotton-based linings are sometimes used for light-duty service. For heavy-duty service, sintered-metal linings perform better than fiber-based linings.

Bridge inspection is performed to determine the condition of the bridges. This inspection includes bridge safety inspections, prepare bridge load ratings, and perform load posting compliance verification in accordance with the NBIS.