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South Coast Rail

South Coast Rail

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South Coast Rail

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  1. South Coast Rail Network Simulation and Operations Analysis Sensitivity Analysis October 22, 2009

  2. Review of NEC Infrastructure:No-Build and Stoughton Alternatives • NEC to Canton Junction, then via existing/restored freight corridors to New Bedford and Fall River • No changes to NEC • Existing third track from Readville to South Station would not be extended • No increase in NEC train volumes required over No-Build Alternative

  3. Review of NEC Infrastructure: Attleboro Alternative • NEC from South Station to Attleboro Bypass, then via existing/restored freight corridors to New Bedford and Fall River • Extensive changes to NEC • Addition of 20 miles of new NEC third track south of Readville • Extensive reconfiguration of Mansfield, Junction, and Transfer Interlockings • All 38 SCR train trips new due to lack of MBTA peak period trains originating on NEC north of Attleboro

  4. Schematic view of: Boston’s South Station (18 tracks, not all available to NEC) Worcester Line Northeast Corridor Fairmount/Dorchester Line Old Colony Main Line Review of NEC Infrastructure: South Station Terminal Zone Figure 1

  5. Summary of Results Presented August 20, 20091 of 4 • The 2030 No-Build scenario is operationally feasible with either diesel or electric operation. • The 2030 Stoughton and Stoughton/Whittenton scenarios are operationally feasible with either diesel or electric operation. Adjustments to operating plans during final design would further improve performance.

  6. The Attleboro Build Alternative is operationally infeasible, based upon: Its failure to achieve the MBTA on time standard in the morning peak, even under the most favorable deterministic simulation conditions using electric locomotives for SCR trains, and The outright failure of the simulation in the evening peak due to overwhelming congestion in Tower 1 and Cove Interlockings. Summary of Results Presented August 20, 20092 of 4

  7. Network Simulation Results Review On Time Performance (All except Old Colony Line trains) 3 of 4 24-hour Results for No-Build and Stoughton Alternatives 7-hour Results for Attleboro Alternative due to Simulation Failure

  8. Network Simulation Results ReviewOn Time Performance(All except Old Colony Line trains) 4 of 4 24-hour Results for No-Build and Stoughton Alternatives 7-hour Results for Attleboro Alternative due to Simulation Failure

  9. Simulation of Attleboro Alternative through PM Peak with four of the eight peak-direction (outbound) SCR trains removed from the PM Peak Period Therefore, reduction of new trains introduced to NEC by the Attleboro Alternative from 38 to 34, a decrease of 11% Sensitivity Analysis

  10. Morning Peak Period (7-9 AM at South Station): 3 inbound from New Bedford — 3 inbound from Fall River 1 reverse-peak outbound to Fall River — 1 to New Bedford 1 inbound from New Bedford — 1 from Fall River(near morning peak period) TOTAL 10 PEAK/NEAR-PEAK TRAINS Evening Peak Period (4-6:30 PM at South Station): 3 outbound to New Bedford — 3 outbound to Fall River 1 reverse-peak inbound from Fall River — 1 from New Bedford 1 outbound to New Bedford — 1 to Fall River(near evening peak period) TOTAL 10 PEAK/NEAR PEAK TRAINS Off-Peak Period: Approximately 2-hour headways in each direction on each branch with support for midday local freight operation Proposed SCR Full Service Plan: 38 Total Trains

  11. Reduced Attleboro PM Peak Period Service Shading Denotes Trains Removed from Simulation

  12. Network Simulator – South Station Attleboro Alternative with Reduced SCR Service Electric Option, Deterministic

  13. Network Simulation Results Attleboro Reduced SCR ServiceOn Time Performance (no Old Colony Trains)

  14. Tower 1 and Cove Interlockings remained extremely congested. Unchanged Amtrak reverse-direction moves to storage during peak period continue to exacerbate the problem of moving trains out of storage. Attleboro alternative least able to accommodate direction reversals. South Station is able to simulate through the PM peak period, but with much delay. Lateness in the departing trains is such that train meets on the Middleborough Branch are rendered infeasible and the simulation again stalls. Network Simulation Results – Reduced Attleboro

  15. Questions?