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April 20, 2010

Comments

Bobby

What is most unfortunate about the acquisition of new hybrid diesel busses is that communities such as Somerville, Medford, Arlington, Malden, Melrose, Watertown, and some parts of Cambridge benefit little or at all from them. Union Square Somerville has one hybrid diesel bus route, the CT2,n which doesn't run on holidays or weekends. Then Ten Hills and East Somerville,Charlestown, and parts of Medford have the 95. Then there are the 94 and 96 routes which are sometimes hybrid, but those are the few exceptions. Sure it's a huge step forward, but not all of greter Boston gets to enjoy these new changes. Similarly with CNG busses, the Cambridge side of the river has very few, all of which end in Cambridge: the 1, 47, and the 66. Maybe that's because all of the CNG bus garages are located on the Boston side of the river. But it would be nice if Boston's needs didn't take priority over the other communities.

Marc Ebuna

On the subject of quieter, more efficient buses with smaller carbon footprints, did MassDOT/MBTA consider and are you still considering acquisition of gas turbine hybrid buses?

These buses are much quieter than conventional diesel or even diesel hybrid buses because the motive power of the bus comes from the batteries which are recharged by the CNG turbine engine only when necessary. With that, the turbine does not make excessive noise since it's not tied to the drivetrain and does not rev up when the bus accelerates. These buses gain further efficiency by running completely electric and because energy is not lost by having the engine tied to a drivetrain, like in a conventional bus.

The only company I know to make these buses in the US is the DesignLine Corporation and so far as I know, they only make 40 foot models, which may well have been the reason they were not purchased with the ARRA grant, if not for the cost. Regardless, I'd be interested to hear what/if MassDOT/MBTA has heard from the CTA and MTA about their experiences with the gas turbine buses and how viable they would be out here.

Buses as quiet as the trackless trolleys without the need to install trolley wire would certainly shut up some neighbourhood complaints about traffic noise pollution...at least from buses. Then the MBTA can get more advocates from its neighbourhoods about the other vehicles on the road that generate the majority of carbon emmisions and noise pollution...congestion pricing and more and better enforced dedicated bus lanes anyone?
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Thanks for the thoughts, and have sent them along to the MBTA for review.

Bob

Aren't these diesel busses? Why aren't they compressed natural gas?

The current busses on the 39 route are all CNG, and I thought that was a requirement of the lawsuit over the big dig and the removal of the E-line.
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Thanks for question. These are diesel hybrid buses that will reduce pollution in Boston neighborhoods through a hybrid system capable of improving fuel efficiency by 20% or greater compared to conventional diesel buses. These types of hybrid buses are the cleanest on the market. In an urban environment with stop and go traffic, they run predominately on the battery. The emissions are extremely low, especially the carbon emissions. The greenhouse gas emissions of the hybrid are much lower than the greenhouse gas emissions of the CNG buses.

Compressed Natural Gas buses were not a requirement of the Central Artery lawsuit. Thanks again.

Bill

Excellent news. Now can the #39 please, please have 60' buses later into the evening? At least on Fridays and Saturdays?

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