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Tag Archives: protection


Track Circuit

Most railroads use track circuits to determine which sections of track are occupied by trains. These devices are actually fairly simple in design, and have been in use since 1872. … Continue reading

New Austrian Tunneling Method (NATM)

The New Austrian Tunneling method (NATM) was developed between 1957 and 1965 in Austria. It was given its name in Salzburg in 1962 to distinguish it from old Austrian tunnelling … Continue reading