Establish a new 3rd main on the Rock Island Line. The project study limits shall be from MP 0.0 (LaSalle Station) to MP 10.5 (Gresham Jct.). The new 3rd main is anticipated to extend from the new 16th Interlocking at MP 1.0 presently in design to the new CREATE P2 Interlocking at CP 74th. It is also anticpated that a new crossover will be required at Gresham to faciliate train movement into and out of the new 3rd main.