This document discusses traction and train movement. It covers: 1. Types of railway services including city/urban, suburban, and main line passenger services as well as freight services. 2. Speed-time curves which show the speed of a train over time and can be used to analyze train movement. Typical curves include periods of constant acceleration, acceleration on a speed curve, free running, coasting, and braking. 3. Simplified speed-time curves which use simpler geometric shapes like trapezoids or quadrilaterals to approximate actual speed-time curves for analysis purposes.