Which rule allows for operation in either direction on the same track based on signal indication?

Rule 261 governs the operation of trains on tracks that feature a centralized traffic control (CTC) system, allowing for bi-directional movement based on signal indications. This means that if a train receives a clear signal, it can proceed in either direction on the same track, provided that operational protocols are followed to ensure safety and proper communication between trains.

The essence of Rule 261 is to enhance flexibility and efficiency on the railway by enabling trains to operate in both directions on a single track segment. This is particularly useful in situations where there may be limited track available or when trains need to reverse direction without significant delays.

The other options pertain to different rules that focus on other aspects of rail operations. Rule 243 generally deals with the use of warning signals and speed restrictions in specific circumstances, while Rule 176 relates to the operation of trains through a station. Rule 241 is concerned with train movements with respect to the authority of the train, particularly as it pertains to non-signaled territories. Each of these rules has distinct applications and does not provide for the same operational flexibility that Rule 261 offers.