SMART rail work has shut Corona Road at the tracks for a couple of days.

The closure, which started Tuesday, is expected to end around 6 p.m. Thursday. Then at 6 p.m. Friday, Ely Road is scheduled to be closed until about 9 p.m. Sunday. Next week, more Petaluma streets will be closed but final dates have yet to be ironed out.

The closures are part of the rail district’s upgrade of the tracks through Sonoma County. Crews are tearing out old crossings and putting in new track and smooth crossings. To do so, they need to shut all lanes at each crossing day and night.

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