Areas of Use
The Great Western Railway used the Tyer's No. 7 electric train tablet instrument at several locations, including the Bampton to Witney section.
Sri Lanka Railways is using this system at several locations.
The Tyer's No. 6 tablet instrument was far more widespread in the UK and was adopted by most railway companies on single line installations. However, when the Tyer's No. 9 key token instrument was patented 40 years later in 1912, it began to replace the No. 6 due to it being compact, easier to use and had far less moving parts to service and repair.
On Britain's national network the use of Tyer's system is now almost extinct, with most lengthy single track lines having been converted to more modern systems such as Tokenless Block or Radio Electronic Token Block. However, as of 2012 the Tyer Electric Token Block remains in use on the Stranraer Line, between Girvan and Dunragit.
Read more about this topic: Tyers Electric Train Tablet
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“The ambiguous, gray areas of authority and responsibility between parents and teachers exacerbate the distrust between them. The distrust is further complicated by the fact that it is rarely articulated, but usually remains smoldering and silent.”
—Sara Lawrence Lightfoot (20th century)