Which statement about loading gauge is true?

• A. The maximum height, width, and length for rolling stock and structures within which must not collide; ensures clearance and safe operation.
• B. The schedule for freight car loading.
• C. The color coding of rolling stock.
• D. The noise level allowed in stations.

Answer: (A)

Loading gauge is the envelope of external dimensions that rolling stock and related structures must fit within to avoid collisions with fixed infrastructure. This means the maximum height and width (and, in some definitions, length) that trains and their supporting components must remain inside so they can pass safely through tunnels, bridges, platforms, and over/under overhead equipment. The goal is to ensure clearance and safe operation across the network.

The other topics—a schedule for freight car loading, color coding of rolling stock, and noise levels in stations—are different ideas (timetable planning, visual identification, and environmental limits, respectively), not related to the physical clearance around the train.