According of officials, Pakistan Railways is experiencing a severe shortage of fuel and if diesel is not received by today night then operating trains will become difficult.Railway officials add that due to default of millions of rupees, Pakistan State Oil (PSO) has stopped the supply of diesel as a result Khyber Mill, Awan Express along with several other trains have been left standing at different stations.According to sources, Railways officials in a tactic to apply pressure on the government have asked the labour union to become vocal. This prompted the union to call an emergency meeting in which it was decided that they would protest outside Parliament against the non-supply of diesel.