Maryland’s Governor-Elect Larry Hogan has promised to cancel the Purple Line, another low-capacity rail boondoggle in suburban Washington DC that would cost taxpayers at least $2.4 billion to build and much more to operate and maintain. The initial projections for the line were that it would carry so few passengers that the Federal Transit Administration wouldn’t even fund it under the rules then in place. Obama has since changed those rules, but not to take any chances, Maryland’s current governor, Martin O’Malley, hired Parsons Brinckerhoff with the explicit goal of boosting ridership estimates to make it a fundable project.
I first looked at the Purple Line in April 2013, when the draft EIS (written by a team led by Parsons Brinckerhoff) was out projecting the line would carry more than 36,000 trips each weekday in 2030. This is far more than the 23,000 trips per weekday carried by the average light-rail line in the country in 2012. Despite this optimistic projection, the DEIS revealed that the rail project would both increase congestion and use more energy than all the cars it took off the road (though to find the congestion result you had to read the accompanying traffic analysis technical report, pp. 4-1 and 4-2).
A few months after I made these points in a blog post and various public presentations, Maryland published Parsons Brinckerhoff’s final EIS, which made an even more optimistic ridership projection: 46,000 riders per day in 2030, 28 percent more than in the draft. If measured by trips per station or mile of rail line, only the light-rail systems in Boston and Los Angeles carry more riders than the FEIS projected for the purple line.
Considering the huge demographic differences between Boston, Los Angeles, and Montgomery County, Maryland, it isn’t credible to think that the Purple Line’s performance will approach Boston and L.A. rail lines. First, urban Suffolk County (Boston) has 12,600 people per square mile and urban Los Angeles County has 6,900 people per square mile, both far more than urban Montgomery County’s 3,500 people per square mile.
However, it is not population densities but job densities that really make transit successful. Boston’s downtown, the destination of most of its light-rail (Green Line) trips, has 243,000 jobs. Los Angeles’s downtown, which is at the end of all but one of its light-rail lines, has 137,000 downtown jobs. LA’s Green Line doesn’t go downtown, but it serves LA Airport, which has and is surrounded by 135,000 jobs.
Montgomery County, where the Purple Line will go, really no major job centers. The closest is the University of Maryland which has about 46,000 jobs and students, a small fraction of the LA and Boston job centers. Though the university is on the proposed Purple Line, the campus covers 1,250 acres, which means many students and employees will not work or have classes within easy walking distance of the rail stations. Thus, the ridership projections for the Purple Line are not credible.