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60 Shared Use of Railroad Infrastructure with Noncompliant Public Transit Rail Vehicles: A Practitioner's Guide Table 9. Worksheet 3--Sample operating plan infrastructure requirements. Option 1 2 3 4 Operating Strict Temporal Shared-Corridor Concurrent Concurrent Regime Separation Spatial Single Track Double Track Separation Operation Operation Station Platforms Grade Crossings Turnouts Passenger Freight Diamonds Signal System CTC ATS Cab signal Cab signal Onboard Cab Signal Device: Passenger Trains None ATS Cab signal Cab signal Freight Trains None None Cab signal Cab signal Special Signal "Mode Change" Intrusion Intrusion System Features Control Software Detection Detection Derails Service Comparison Depending on the operating regime chosen, different service capabilities are possible. Option 1 is a Strict Temporal Separation Operation; Option 2 is Spatial Separation; Option 3 is Concurrent Single Track; and Option 4 is Concurrent Double Track. The parameters affected are: passenger service headways, hours of service, and freight blackout windows. The initial service design and maximum theoretical values under different operating regimes are summarized in Table 11. The values shown can be considered typical default scenarios, and should be modified to suit a par- ticular situation. Each option should be analyzed on the basis of its proposed Infrastructure; Passenger operations; Passenger distribution; and Freight operations. Appendix 9 summarizes features, characteristics, and capabilities of each of the four alternatives. Information contained in that table is representative of the factors that should be considered in the analysis. Cost and Ridership Analyses An important part of any project study is collection, comparison and analysis of data describing capital and operating costs for traditional transit development and for shared-track alternatives. Table 10. Worksheet 4--Disposition of major structures. Option 1 2 3 4 Operating Strict Temporal Shared Corridor Concurrent Concurrent Regime Separation Spatial Single Track Double Track Separation Overbridge Overpass Viaduct Grade Separation Shared ROW, Wall Bridge over water