Fully 75 per cent of the grading work is now done, on the Iowa Central extension to Lyle, and the rest will be completed by the 1st prox. Track layers started Monday, laying north from Manly Junction. It will take about thirty days to iron the extension. The entire twenty miles will be in thorough running order by Dec. 1, on which date the Minnesota & Northwestern will be running through cars to St. Louis and Kansas City, over the Central Iowa and Wabash roads.