A stamped metal plate riveted in the control cab of each steam locomotive reminds train operators that they should respect single-line operation semaphore signals on thins single track railroad.
The Darjeeling Himalayan Railway, locally known as the "Toy Train", is a 2 ft (610 mm) narrow gauge railway that runs between New Jalpaiguri and Darjeeling (India). It is still operated by vintage British-built B Class steam locomotives. Operations between Siliguri and Kurseong have been temporarily suspended since 2010 following a Landslide at Tindharia (view photos of the landslide).
For more info about the DHR steam locomotives, read en.wikipedia.org/wiki/DHR_778_(locomotive) and www.irfca.org/docs/locolists/dhr-locos-full.html.
For more information about the Darjeeling Steam-powered Train, read en.wikipedia.org/wiki/Darjeeling_Himalayan_Railway.