DART Rail Institute Definitions Practice Exam 2026 - Free Rail Institute Definitions Practice Questions and Study Guide

Two connecting switches that let trains move from one track to another in both directions are called a crossover. It pairs two turnouts so you can enter on one track and exit on the other, in either direction, which matches the idea of an entrance and exit between the tracks. A single turnout only diverts one path, not both directions. An interlock is the safety system that ensures switches and signals are set correctly, not the physical connection itself. “Switch pair” isn’t the standard term for this arrangement.