Edited sentence: In March 2011, PA-TEC requested that SEPTA consider demarking their four dormant railroad lines acting as rail trails with signage.PA-TEC responded with the following statement:.PA-TEC was willing to work with the transit agency on this project, in hopes of maintain a high profile for the dormant rail corridors.SEPTA rejected PA-TEC's request, citing the following:.Their request was based on a federal study completed by the National Transportation Research Board in 2007, which stated the following: