OTTAWA Construction crews will be working late nights and weekends on the O-Train south extension this summer in a bid to speed up construction of the north-south rail line. The city of Ottawa says as part of the Stage 2 O-Train south extension project, TransitNEXT will be increasing work hours and days at various locations across the project to maximize the 2021 construction season. The city says the goal is accelerate construction timelines where possible. O-Train construction sites at Ellwood Diamond (Via Rail crossing), the Hunt Club Rail Bridge and Limebank Station will see double shifts, with work starting at 7 a.m. and finishing at 3 a.m.