Have you seen lots of activity on the railroad tracks in Marion County the past few weeks? That’s because the Burlington Northern and Santa Fe Railroad crews are doing routine maintenance and tie replacement. Crews gathered in Knoxville this morning as they continue their work. BNSF officials told KNIA/KRLS News that the maintenance is routine, and not part of any effort to expand services in the county. Approximately 50 crew members were in Knoxville this morning, from all over the country.