Yesterday, I described how an effective private transit system could be designed for all but the smallest urban areas by simply scaling up the taxicab association model to buses. Rather than use this model, many of America’s subsidized transit agencies have tried a different sort of scaling upwards: from buses to rail. This has led to numerous planning disasters.
Too many public officials imagine that running a rail transit system is just the same as running a bus system, only with bigger vehicles. Jonathan Richmond’s paper (since expanded to a book), The Mythical Conception of Rail Transit in Los Angeles quotes the Los Angeles Times: “One of the arguments made most often for the rail line is that it will be cheaper to operate because a single driver on a train can carry up to five times as many passengers as a bus.”
These are, as they say, famous last words. The reality is that a bus system does not scale up to a train system: they are quite different beasts, and running a train system not only requires a completely different set of skills, it entails a much higher risk — a risk that transit agency officials can ignore because they simply impose it on taxpayers and, in the worst cases, transit riders.
