Token instrument is apparatus used for electrically controlling issue to driver of train of tangible and portable token, such token being authority to occupy particular single-line section to which it applied; three examples of instruments using simpler method of manipulation are respectively Tyers' no. 6 tablet instrument, modified form of Webb and Thompson's staff instrument, and key token instrument. Paper read before Instn. Ry. Signal Engrs.
Token instruments and their use in securing safety in single-line working
Ry. Gaz
Railway Gazette and Railway News ; 50 , n 3 ; p 77-78
1929
2 pages
Aufsatz (Zeitschrift)
Englisch
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