For what signal is the allowable speed indicated when it displays a flashing green or yellow?

The correct answer is that the allowable speed indicated by a flashing green or yellow signal is found as displayed on the Train Operations Display (TOD). The TOD is a crucial tool for engineers, providing real-time information about the operating conditions of the train, including speed restrictions linked to specific signals.

When a signal displays a flashing green or yellow, it indicates that the train can proceed but must adhere to a specific speed limit. This information is vital for ensuring safe operations and maintaining adherence to safety protocols. The TOD serves as the primary source of this critical data, effectively guiding the engineer in taking appropriate actions based on current conditions.

While the central dashboard and the train conductor's manual may contain useful operational information, it is the TOD that specifically details the speed restrictions corresponding to the signals. Additionally, while the transit authority establishes the overall safety rules and guidelines, the immediate application of these regulations in real-time is conveyed through the TOD.