Saturday, May 23, 2009

Speed Isn’t What It Used To Be

When we think of “high speed” and “rapid” we may think of something really fast, maybe like a rocket.

But when our Federal government defines these terms, it isn’t all that it should be.

High Speed Rail (HSR)
Take “high speed” rail, for an example. Now, when I think of that term, I’m thinking the Bullet Train in Japan or the TGV in France. Speeds over 150 mph up to 200 mph, and maybe faster.

Is that what our Federal government is thinking? Not quite. While our President declares “Make no little plans,” the legislation is designed to lower expectations. “High speed rail” is 110 mph, a full 40 mph below the top speed of Amtrak’s Acela.

Bus Rapid Transit (BRT)
BRT is supposed to be a blending of buses and rapid transit. So, it should be as fast as rail rapid transit (like a subway), but cheaper to build with buses and simple pavement replacing more costly and complex rails, power and signals systems.

In theory, the buses would run on a separate busway or a highway HOV (high occupancy vehicle) lane, therefore traveling “rapidly” (say, 40 to 60 mph) between stations.
Let’s contrast theory and practice.

In Boston, the Silver Line is considered BRT. There’s the Washington Street Silver Line, where the bus has a bus lane and some advantages (pre-emption) at the frequent traffic lights. So, maybe between stops and red lights, the bus may get up to about 25 to 30 mph. But when you add in time waiting for lights, the speed averages maybe 15 or 20 mph. What’s so rapid about that? Many in Roxbury and the South End know we’re not talking travel times equivalent to the long-gone elevated Orange Line on Washington Street.

Then there’s the Silver Line from South Station to Logan Airport and City Point in South Boston. Part is in a subway tunnel, not unlike the four rail transit lines (Green, Red, Orange and Blue). Now the Red Line travels at up to 50 mph in the subway. Even the Green Line can hit 30 mph or more in the subway. So what about that BRT? The Silver Line tunnel opened with a posted speed limit of 10 mph. Even at 15 or 20 mph, is that what you’d call “rapid.”

Ashmont-Mattapan High Speed Line
Another local speed misnomer is the least know segment of Boston’s rail transit system – the trolley line between Ashmont and Mattapan. When it opened on August 29, 1929, it was truly “high speed.” A typical trolley line ran in city streets, which was fairly slow going. The “High Speed” line was built along a partially abandoned rail line, avoiding city streets, and reaching “high speeds” up to 30 mph.

Today, the line still runs, with streetcars approaching 70 years old, still reaching speeds approaching 30 mph. But to many, it’s still known as the High Speed Line.

Conclusion
Speed certainly isn't what it used to be!






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