Los Angeles County transportation leaders faced a politically tricky decision Thursday in how to connect two light rail lines: They could back a plan favorable to South Bay riders, or one preferred by Los Angeles officials.

In the end, the South Bay prevailed — if only temporarily.

Directors with the Metropolitan Transportation Authority voted 7 to 4 to support a plan that would allow South Bay commuters to travel most of the Green Line without changing trains. But the victory for South Bay riders could limit the capacity on the Crenshaw Line, which will be restricted to two-car trains for a year after it opens.

The Metro board also narrowly rejected an attempt by Los Angeles Mayor Eric Garcetti to delay a decision on the issue until February.

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