Architect Frank Prial Jr. walked the Planning & Zoning Commission through the proposed reconstruction of Greenwich Plaza at Railroad Avenue and spelled out the new look planned for the key gateway to Greenwich. A major redesign of the exterior and interior of the Greenwich train station would be carried out, including new and improved pedestrian access, as part of the project, he said. The train station itself, Prial said, would be given a new glass facade with a large clock in the center and an extended canopy over the sidewalk, a design reminiscent of railway stations in Europe, the architect said. The Ashforth Co. owns the site and is seeking approval for the new construction at the complex in the center of downtown. A vote on whether to approve the plan could come at a later meeting after another session with the architecture committee.