Analysis of information sources in references of the Wikipedia article "Semi-metro" in English language version.
descending into tunnels in the style of conventional underground mass transit
In essence, a semi-metro consists of light rail cars operating on exclusive tracks, generally on the surface but descending into tunnels in the style of conventional underground mass transit in city centres
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... San Francisco and Boston, both with semi-metros and independent plans for new tramcars.
brake equipment to be fitted to 90 two-car articulated semi-metro trainsets, under construction by Duwag, for service in the municipal areas of Bonn, Cologne and Essen.
Semi-metro: Light rail on reserved right of way over congested parts of line typically in tunnel or viaduct for grade separation designed to Metro standards, with priority surface light rail in other sections
Do lekkiej kolei zaliczymy także systemy pośrednie między metrem a tramwajem. Bezkolizyjność trasy oraz kolejowy system sterowania w połączeniu z taborem tramwajowym to semi-metro. System taki może działać jako semi-metro w obszarze śródmiejskim, a w dzielnicach zewnętrznych jako szybki tramwaj. — Light rail also includes intermediate systems between the metro and the tram. The collision-free route and the railway control system combined with the tram rolling stock are called semi-metro. Such a system can operate as a semi-metro in the city center, and in the outer districts as a rapid tram.
Rather soon attention was given to Light Rapid Transit modes such as pre-metro and semi-metro (Hannover) employing heavy trams instead of light trains to run on open-air independent or semi-independent tracks, and just and just seldom using short bypass tunnels or fly-evers to skip congestion in central areas.
pre-metro: a light rail transit system designed with provisions for easy conversion to rail rapid transit
By this time, there was considerable interest in reconfiguring the U.S. subway-surface streetcar systems to resemble northern European practice, and there was increasing recognition that modern tramways might be appropriate for urban regions that long since had given up streetcar operation.