This interpretive sign is a key landmark located on the wooden terrace viewpoint near the Doi Khun Tan National Park headquarters. The carved wooden sign states, "From this point, you can see trains passing in and out of the Khun Tan Tunnel". It serves to inform visitors of the strategic vantage point for observing trains traversing the valley and passing through the historic Khun Tan Tunnel below. The perspective from this sign offers a view of the railway tracks winding through dense evergreen forests and the northern entrance (Lamphun side) of the tunnel, symbolizing the historical pride of Thai railway engineering.