WaPo has a report that also focuses on the law of unintended consequences. In this heat, we need to be encouraging people to use public transportation rather than cars so that they're emitting fewer greenhouse gasses. But the heat itself is going to make using public transportation in Washington, D.C. even more difficult.
Metro passengers should prepare for delays and crowded conditions on all rail lines this week. Metro plans to start slowing trains to 45 mph in the aboveground sections, instead of running at the top speed of 59 mph, to conserve electricity.
In addition, Metro will add two to three minutes between trains during the afternoon rush. Maintenance personnel will inspect the tracks in the aboveground sections for "heat kinks," which form when overheated track expands.
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