Gwalior, Oct 16: Rail traffic was affected after a goods train derailed last night at Sandalpur near here, railways sources said today. The train was on its way from Delhi to Mumbai when four empty oil tankers derailed and delayed several important trains, including GT and Tamil Nadu Express, they said. No one was injured in the incident, they added. The train services were operating through a single track and the damaged track would be repaired soon, the sources said. Bureau Report