Where can track cars enter the main track when rule 261 is in effect?

When rule 261 is in effect, track cars can enter the main track at locations controlled by a home signal. This is crucial for maintaining safety and ensuring that the entrance of track cars is managed in a controlled manner.

Home signals are set in place to provide indications of track occupancy and to manage the movement of trains and other vehicles. By requiring entry at these controlled points, it helps to coordinate the operations on the main track, prevent accidents, and ensure that track cars are allowed to enter only when it is safe to do so. This regulatory approach helps maintain order in train operations and minimizes potential conflicts that could arise from unauthorized movements.

In contrast, options suggesting entry at any station without restriction, only at designated crossover points, or at random locations along the track do not provide the same level of safety and operational control that the use of home signals guarantees. These alternatives could lead to dangerous situations, making the rule clear about the necessity of controlled entry points.