During which conditions must the headlight be dimmed when passing a public crossing?

Dimming the headlight is essential in specific scenarios to enhance safety and minimize distractions for people at public crossings, particularly when switching is occurring. When a train approaches a station or yard where trains may be switching cars, having the headlight at a lower intensity helps reduce glare and improves visibility for personnel and the public in the area. This practice is crucial because it allows for safer interactions in environments that may have increased foot traffic or operational activities.

The other situations presented do not inherently require dimming the headlight. For example, while approaching a station stop or passing a public crossing without warning signals does involve consideration for visibility, they do not specifically mandate a change in headlight intensity. Dimming is particularly critical in switching areas where operations are more complex and require heightened awareness.