loop tunnel

loop tunnel

[′lüp ‚tən·əl]
(engineering)
A tunnel which is looped or folded back on itself to gain grade in a tunnel location.
References in periodicals archive ?
Graham Clark, Director of Global Sales and Marketing, said, "The recent results obtained from our short loop tunnel diode experiment show that the CMOS process we are developing for this technology is experimentally viable.
Among its most dramatic featuring are the Morteratsch Glacier, Alp Gruem, the picturesque town of Poschiavo and the exciting loop tunnel in the open air at Brusio.
Premier Denis Napthine said, "For the first time, metro rail passengers, through their mobile phone carrier, will have high-quality mobile coverage throughout the City Loop tunnels and its underground stations.
The Victorian Coalition Government has reached an agreement with Optus, Telstra and Vodafone to extend mobile coverage to the City Loop tunnels, Premier Denis Napthine and Minister for Public Transport Terry Mulder announced today.
This will ensure that Melbourne s City Loop tunnels and underground stations will be mobile phone friendly.