A Wasco County Planning Commission hearing on Union Pacific’s request to expand an existing railroad siding on either side of Mosier has been postponed. It was originally scheduled for this coming Tuesday, but has been rescheduled for June 7 at 3 p.m. at the Columbia Gorge Discovery Center. The Union Pacific application seeks to expand the existing railroad siding on either side of Mosier for just over four miles of new second mainline track and realigned existing track. It includes five new equipment shelters, drainage structures, a retaining wall, new lighting and signage, and wireless communication poles The request also includes off-site wetland mitigation east of the primary project site.