 This election remains controversial today, as the city had a much smaller population in the 1980s, and the lack of membership in DART will likely prevent the city from participating in the planned Silver Line commuter rail system.But since Coppell borders DART member cities Carrollton, Dallas and Irving, it can rejoin at a later date if it wishes provided that it can assess the mandatory 1% sales tax.The future Cypress Waters station in Coppell is expected to be served by the Silver Line.