WASHINGTON — Engineering, project finance, rail construction, and transit operation firms in the U.S. and four countries have expressed interest in helping the District of Columbia develop a planned 22-mile streetcar system, district Department of Transportation officials announced this week.

DDOT received 20 responses from firms in China, Spain, Great Britain and Japan, as well as the U.S., to its June 26 request for information, agency spokesman Dara Ward said in a release.

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