PRESENTATION MBTA Green Line Positive Train Control Project Presented to: MBTA Board of Directors | December 2012

Agenda

• Project Goal • Why Green Line PTC/Evaluation Criteria? • Key Findings • Maintaining Green Line Service Characteristics • Projected Implementation Costs • Next Steps • Project Implementation Schedule • Q&A

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Project Goal

• Provide safe, reliable and efficient service to the traveling public

• Limit the risk of an accident by on the MBTA’s Green Line by implementing a Positive Train Control (PTC) system

• Project divided into three phases: – Phase I – Vehicle Collision Avoidance Assessment – Phase II – Condition Assessment – Phase III – Alternatives Analysis

and Recommendations

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Positive Train Control

• Positive Train Control is a system to prevent: – Train‐to‐train collisions – Excessive speed derailments, including derailments

related to curve restrictions, and slow orders – Train incursions into established work zones – Movement through main line switch in the incorrect

position.

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Why Green Line PTC?

The National Transportation Safety Board (NTSB) investigation of a Green Line May 2008 incident, which involved one fatality and multiple injuries, concluded:

“This accident could have been prevented had the Massachusetts Bay Transportation Authority Green Line been equipped with a positive train control system that could have intervened to stop train 3667 before it could strike the rear of train 3681.”

Synergies of PTC and Green Line “state of good repair” investments, • Track switch replacement • Microprocessor interlockings • Replacement of obsolete signal components • Improved communications (Fiber backbone)

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MBTA Green Line PTC Phase III Alternatives Analysis Evaluation Criteria

• Operational Improvements/Impact • Order of Magnitude Cost • In‐service History • System Design Principles • Impact on Collision Avoidance • Vehicle Considerations • Infrastructure Improvement • Modification and Expansion • Fall‐back Operations • Additional Operational Advantages • Feasibility of Implementation

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Green Line PTC Key Findings Maintaining Green Line Service Characteristics

• Green Line with each of the 3 PTC Technologies (Moving Block, Virtual Block, Distance‐to‐Go) was simulated. – PTC results in degradations in travel times, passenger wait

times, and throughputs – PTC will require mitigation in order to maintain current Green

Line customer experience. • Three mitigation scenarios based upon speed

improvements were simulated. – Speed Improvements – Infrastructure Improvements – Three Car Operations

• Mitigation strategies improved throughput and travel times.

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Green Line PTC Key Findings

• Scores of 3 PTC technologies differ by less than 2 percent.

• MBTA should progress PTC preliminary design while maintaining ability to support any of the 3 technologies.

• As detailed plans and specifications are developed, MBTA opt for: – Specification of a particular technology or; – Selection of a supplier/integrator based on a

performance specification not tied to one technology.

(Cont.)

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Maintaining Green Line Service Characteristics – Trip Time

Base

line

Not

Fea

sibl

e

PTC without Mitigation PTC with Mitigation

PTC with Speed Increase &

3-Car Ops

PTC with Vehicle Changes

PTC with Operational

Changes

PTC with Speed

Increases

Better than or equal to Baseline

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Aver

age

Trip

Tim

e –

Cent

ral

Subw

ay

Maintaining Green Line Service Characteristics – Central Subway Throughput

Base

line

Not

Fea

sibl

e

PTC without Mitigation PTC with Mitigation

PTC with Speed Increase &

3-Car Ops

PTC with Vehicle Changes

PTC with Operational

Changes

PTC with Speed

Increases

Better than or equal to Baseline

10

Pass

enge

rs p

er H

our

Projected Implementation Costs

• Estimated Green Line PTC capital cost (2012 $): – CBTC Moving Block ‐ $662 million, – CBTC Virtual Block ‐ $645 million – DTG estimated ‐ $721 million

– Estimates include train control and vehicle installation costs for

a “live” system

– Estimates reflect PTC mitigation, including track upgrades, turnout replacement and additional vehicles/power system upgrades to support 3‐car operation

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Green Line PTC Next Steps

• Address Green Line train control “state of good repair” issues, – Build out fiber backbone, – Track circuit replacement, – Replace interlockings for better reliability, make

them “PTC ready”, – Track switch replacement (reliability, speed

improvements) • These projects will make Green Line “PTC Ready” and

provide improved service (better passenger information, reliability and travel times),

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Green Line PTC Next Steps (GLX)

• GLX can serve as Green Line PTC initial deployment phase (vehicles, central control and wayside),

– Improves implementation efficiency by eliminating revenue operating constraints during construction,

– Provides signal system cost savings versus wayside signaling now and PTC after GLX opens.

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(Cont.)

Green Line PTC Implementation Schedule

Standard Procurement (Months)

6 12

18

24

30

36

42

48

54

60

66

72

78

84

90

96

102

108

114

120

Consultant Design

Prebid/Bid & Award

Final Design Submittals & Review

Manufacturing of Equipment & Factory Testing

Vehicle Installation

Field & OCC Installation

Testing and Certification

Total Duration

18 Months

18 Months

12 Months

30 Months

48 Months

60 Months

18 Months

9 Years 14

Decision point – 22

months

Summary

• Begin PTC design and Readiness Projects

• State of good repair projects also achieve PTC

readiness – Immediate benefit to riding public through decreased travel

times and increased service reliability

• Green Line Extension (GLX) provides unique

opportunity for Testing and Validation

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Q&A

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