There are some 300,000 weekly trips between the three centres of Shannon, Ennis and Limerick. Based on a projection of about 15% of that business transferring to the rail network, there is a belief that this is viable. The scheme refers only to the spur because the Ennis-Limerick line has been upgraded and considerable work is continuing on it, which has been helpful in assisting the commuter link between Limerick and Ennis.