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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
