Use of 4 rails on London's Northern Line
CharlasLibrarything Railroad (The LTR)
Únete a LibraryThing para publicar.
Este tema está marcado actualmente como "inactivo"—el último mensaje es de hace más de 90 días. Puedes reactivarlo escribiendo una respuesta.
1ulmannc
The latest copy of Today's Railways UK just arrived here in the US about a week ago or so. The photos of the Northern Line show 4 rails for each path. Why 4? Is there a book or link that explains this?
2thorold
http://en.wikipedia.org/wiki/Railway_electrification_system#Fourth_rail
Two rails for the wheels, two for the electric current.
In the early days they had trouble with electrolytic corrosion caused by the return current through the running rails and metal tunnel linings, so they added the negative centre rail to eliminate the need to run current through the running rails.
Two rails for the wheels, two for the electric current.
In the early days they had trouble with electrolytic corrosion caused by the return current through the running rails and metal tunnel linings, so they added the negative centre rail to eliminate the need to run current through the running rails.
