1952-1968
- On January 10, 1968, the Lincoln Evening Journal had an article with a map displaying locations of train/car/pedestrian collisions resulting in 55 deaths, 57 injuries and 115 properties damaged. This shocking news brought to attention the immediate need for safety improvements.
1971
- Nebraska legislation authorized RTSD's for 25 years. * This authority was later extended indefinitely
1973
- Corridors 'A', 'B', 'C' and 'D' were approved as Federal Highway Act demonstration projects.
- Corridors 'E' and 'F' did not have a positive benefit/cost analysis over 20 years, therefore, these corridors were not approved.
- Agreements were established with the City, County and Railroad to provide cooperation at grade crossings for: new signals, new signals with gates, signal upgrades and improved grade crossing surfaces with permanent materials
- Cost of improvements through 1984 = $922,800.
1975
- Five railroads -- Burlington Northern, Union Pacific, Missouri Pacific (MoPac), Chicago Rock Island and Pacific, and Chicago Northwestern -- entered the Lincoln area. At this time Lincoln's population was approximately 150,000. Most railroad crossings were at grade.
1976
- Corridor 'A' work was completed by Burlington Northern and Union Pacific at a cost of $483,000.

27th Street Viaduct
1979
- Corridor 'B' work was completed, including the removal of crossings at West 'O' and West 'P', and new track construction in Burlington Northern.
1980
- Corridor 'B-3' was added to provide Coddington Ave. Bridge replacement on US 77 Bypass Alignment.
- Chicago, Rock Island and Pacific railroads ceased operation in Lincoln.
- Corridors 'C' and 'D' were modified to include only grade separations on:
- N 27th Street Viaduct (completed 1986)
- 'K' Street Connection (completed 1988)
- 'L' Street Connection (completed 1991)
- Van Dorn Street Viaduct (completed 1993)

Viaduct over BNSF at Waverly
1982
- A new viaduct was constructed in Waverly over Burlington Northern railroad.

West Van Dorn bridge near SW 56th Street
1983
- The West Van Dorn Bridge was rebuilt over Burlington Northern near SW 56th St.
1985
- NDOR completed the US 77 Viaduct.

US 77 Viaduct
1988
- The 'K' Street Connection was completed.
1990
- The Lincoln City Engineer was named the Executive Director of RTSD. Previously, from 1971 to 1990, the RTSD had its own Executive Director.
- Cooperation continued between the City, County and Railroad to keep improving signals and permanent materials. Total expenditures from 1990 to 2004 = $2,143,463.
1991
- The 'L' Street connection was completed.
- The Havelock underpass was rebuilt

10th Street Viaduct
1993
- The Van Dorn viaduct was completed.
- The 10th Street viaduct was replaced.
1994
- Lincoln Public Works and Utilities Department took over secretarial/business office functions of RTSD.

Pedestrian underpass constructed at 'F' Street school crossing

Haymarket Bridge over BNSF
1995
- Nebraska Legislature extended RTSD authority indefinitely, which removed the 25 year limit set in 1971.
2000
- A pedestrian underpass was constructed at a school crossing on 'F' St.
- The Haymarket Park pedestrian bridge was built over BNSF.
2004
- The 'A' Street viaduct was constructed, which closed grade crossings at 'A' St., 'B' St., 'C' St. and 'F' St.
- The Firth viaduct was constructed.

Viaduct constructed on 'A' Street

Firth Viaduct
2008
- The Harris Overpass at 9th and 'O' was replaced
2009
- Locomotive horns were silenced along Cornhusker Highway after the establishment of a quiet zone. Additional safety features were installed at four crossings, including raised medians and a wayside horn, to allow silencing of locomotive horns without compromising safety.

