If you rely on the Mount Washington, Cold Spring, or Woodberry light rail stations to get around town, consider this your fair warning — the city has decided to close all three stations for emergency repairs starting on Friday.

The culprit? Erosion. Which, as you may remember, caused a leetle transit problem last month, as an entire city block collapsed. Heavy rains in the Baltimore area have made already-existing erosion problems even worse, and the city determined that it was better to deal with the problem now rather than wait for another disaster. To put things in perspective: The 26th Street collapse will cost around $18.5 million to repair, while these preemptive light rail fixes will add up to only about $1.5 million. That’s why we fix things before they fall apart.