Last I looked the south (Tewksbury - Wilmington Jct.) leg of the Lowell Jct. wye was in need of rebuilding, but that's not even 200 yards of track. I don't think the old NH Div main leg of the North Chelmsford wye (Nashua - Lowell) will need much attention. When in service, the chemical plant lead was a facing-point eastbound turnout off the Western Route main a few hundred yards RR west of Lowell Jct.