On what types of tracks may a single car be left unattended?

Single cars may be left unattended on industry tracks and sidings due to the nature of these tracks, which are specifically designed for such activities. Industry tracks and sidings are typically associated with facilities that require temporary storage of railcars, making it acceptable to leave single cars there. These areas are not part of the main line where active train operations occur, and they are intended for less frequent usage, allowing for cars to be safely stored without interfering with regular train traffic.

In contrast, leaving cars unattended on the main track would pose significant safety risks, as it could obstruct passing trains and create hazardous conditions. Auxiliary tracks are also typically used for specific purposes like maintenance or storage under certain conditions, and the practice of leaving cars unattended there may depend on additional restrictions. During switching operations, cars should generally be monitored closely to ensure safety and efficient train movements, further emphasizing the suitability of industry tracks and sidings for leaving cars unattended.