The reason behind these was not because of WAP 7. Mostly the route was doubled between MS-VM, then ARI-VLDE. The crossings are mostly happening in these sections only, so that the wait time for crossings are reduced. Now a days, if anyone travels in Vaigai, they can found that it will run in normal speed only with WAP 7 too; this is because of the wait time reduce. If it runs in old speed, it will reach every station before the scheduled time and need to wait in station till scheduled departure time. To avoid this, crews riding in normal speed, and for this Vaigai reaches very early their destination. Vaigai will return to his regular speed only if travel time reduced.