Three yellow lanterns hanging one above another to the right of a track indicates what speed restriction?

The presence of three yellow lanterns arranged vertically indicates a speed restriction of 10 MPH for a train. This signal is a specific warning used in rail operations to alert train operators to a reduced speed due to potential track conditions or other hazards ahead.

The color yellow typically signifies caution, and when combined in a vertical arrangement, it communicates a precise instruction to the train crew regarding the maximum safe speed they should adhere to in that section of the track. Recognizing and appropriately responding to these signals is critical for maintaining safety and efficiency in train operations. Understanding the nuances of signal meanings helps ensure that the train operators can effectively react to the conditions they encounter.