Natural way of lighting up the tunnels , is there a person always present who is in charge of adjusting the mirror as per the direction of sunlight out there ?

Nice photo .This location for photograph is unique .Only two photos of this location,one by NRly & one by John Lacey are available on the net.yours appears to be third . Even with dim light ,photo of bridge ,gallery railing on 2nd ,3rd layer & pipeline is very clear . Excellant

Photos of Rail motor on kalka-shimla are excellant . I always like these photos as it takes me back about 27 year(1982) down the memory lane when I travelled (by compulsion) on Rail motor between Kalka -shimla with my wife on my honeymoon trip as there was no accomodation in first class in connecting train of kalka mail & my railway pass entitled me to traven in rail motor .