Token only[ edit ] The token system was developed in Britain in the 19th century, to enable safe working of single-line railways.
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If a branch line is a dead end with a simple shuttle train service, then a single token is sufficient. The driver of any train entering the branch line or occupying any part of it must be in possession of the token, and no collision with another train is possible. One Train Only token used by Indian Railways For convenience in passing it from hand to hand, the token was often in the form of a staff, typically mm 31 in long and 40 mm 1.
That really does cause a great delay because if the staff is not there, the train must stop while a man is sent on a horse to get it [from the other jeton registru of the section]"; quoted in Williams.
The simple token system was therefore extended: if one train was to be followed by another in the same direction, the driver of the first train was required to be shown the token, jeton registru not take possession of it in theory he was supposed to physically touch the token, but this was not strictly followed. The driver was given a written authority to enter the single line section, referred to as the ticket.
They could then proceed, and a second train could follow. In the earliest days the second train could proceed after a designated time interval, as on double lines at the time. However, following the Armagh rail disaster ofblock working became mandatory.
Seeing the train staff provided assurance that there could be no head-on collision. To ensure that the ticket is not issued incorrectly, a book of numbered tickets is kept in a locked box, the key to which jeton registru permanently jeton registru to the token, or is the token. In addition, the lock prevents the token being removed until the ticket box is closed, and it cannot be closed unless the book of tickets is in the box.
Once a ticket is issued, its number is recorded in a Train Register book, and the token is locked in a secure place. This system is known as staff and ticket. In a variation on this principle, called divisible train staff, a section of the token referred to as the ticket portion was designed to be removed and handed to the driver instead of a paper ticket.
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The staff and ticket system was still jeton registru inflexible for busy lines, as it did not allow for the situation where the train intended to carry the actual token was cancelled or running very late. To provide for this, the electric train token system was developed.
Each single-line section is provided with a pair of token instruments, one at the signal box at each end. A supply of identical tokens is stored in the instruments, which are connected by telegraph lines. A token can be removed from one instrument only if both signalmen co-operate in agreeing to the release. Once a token has been removed, another cannot be removed until the token which is "out" is replaced in either instrument.
There are variations on this sequence of events. By this means, it can be ensured that at jeton registru one time, only one token is available to be issued to a driver.
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Tokens belonging to adjacent sections have different configurations to prevent them being inserted into the wrong instrument. Nevertheless, in the Abermule train collision inlax working procedures allowed the safeguards provided by the electric token system to be circumvented; a driver was handed a token for the wrong section, and proceeded on the mistaken belief that the jeton registru was correct.
Aceste exemple pot conține termeni colocviali. Traducere "jeton cu aprecierea mea" în engleză Alte traduceri A token of my appreciation for helping me out last night. Propune un exemplu Pe an ce trece, aprecierea mea pentru mama ta crește. As the years go by, my appreciation for your mother grows. Poate ar trebui să-ți arăt aprecierea mea.
To try to prevent this, the UK Board of Trade Railway Inspectorate recommended that the signals controlling entry to the single line section starting or section signals were locked at danger unless a token had been released jeton registru the relevant token instrument. Collection of the token[ edit ] In a basic railway situation, the token can be collected personally by the driver at the start of their work on a branch line, and surrendered by them at the end of their work there.
Where the single line section is part of a through route, then it is likely that each passing train would require to surrender and collect a token at each token station. Where the trains stop at every station this is a convenient arrangement, but where some trains run through without requiring to make a call i. In the case of driver-only operated trains, a dead-mans hold over button was provided, so the driver could exchange the token without the emergency brake being applied.
Token (railway signalling) - Wikipedia
A large staff could be handed over without any special apparatus, but if the system in use employed miniature staffs, tablets or key tokens, these were usually placed in a leather pouch attached to a hoop, and the fireman could put their arm through the hoop held up by the signalman, and vice versa as the locomotive ran past.
Fixed token exchange apparatus was used on some railways. Trackside equipment was fitted near each signal box to hold the pouch containing the token and to receive the token pouch that was being given up.
When the Aberdeen to Inverness passenger service was converted jeton registru diesel multiple unit operation in the late s, the train-borne equipment was fixed adjacent to the train guard's compartment, and he was responsible for managing the mechanical handover; a special buzzer code enabled him to confirm to the driver that the correct token had been successfully received.
On the Victorian Railways automatic staff exchangers survived on the North EasternWesternand Geelong-Ballarat lines till as recently as the late s. On the South Australian Railwaysauto staff exchangers were used on the former broad-gauge line between Adelaide and Port Pirie.
In all these Australian aplicație de monitorizare bitcoin both steam and later diesel electric locomotives were fitted with auto exchangers. The tablet system allowed for banking engines used for steep sections with a separate bank engine key.
Trains are able to run jeton registru consecutive single-track sections, with the operation being controlled by radio from a central control room. Every train carries an electronic unit jeton registru receives and sends an encrypted block of data which represents the token.
The system is designed so that the control centre cannot issue a new token for a section of line until the current one is 'returned'. Trains cannot send tokens to each other. This system allows the whole line to operate without any additional signalling personnel, and has functioned without major incident. The Ternkey Jeton registru  - essentially a hybrid between conventional token working and internet technology - is in use on the Isle of Man Steam Railway between Castletown and Port Erin.
Variations[ edit ] Intermediate block posts[ edit ] In certain circumstances it was convenient to shorten the single line sections by providing an intermediate signal box equipped with token instruments without providing a passing loop there. This was done if there was, for example, an important siding connection at the intermediate location. It also enabled following through trains to run at closer headways, but did not facilitate jeton registru movements. Because of the greater risk of collision in the event of irregular working, the practice was deprecated in the UK, although some examples did exist for example at Beddington Lane on the Wimbledon - West Croydon line before resignalling.
Usually in such cases special interlocking was provided between the two instruments at the intermediate signal box to ensure that trains could not be accepted from opposing directions at the same time. Long section working[ edit ] This section does not cite any sources.
Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. March Learn how and when to remove this template message In double line working, at times when traffic is light it is convenient to "switch out" an intermediate signal box, allowing the signal boxes on either side to communicate directly for train control.
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On single lines this is more complicated because of the train tokens being identified with single line sections, but the difficulty can be overcome by some form of long section working.
An alternative system jeton registru special long-section token systems; when long section working is to be instituted, all the short section tokens must be in their respective instruments; by switching to the long-section method, tokens for the long section can then be obtained in the ordinary way.
Obviously all the long-section tokens must be restored before the normal working can be resumed. Unattended operation[ edit ] Token instruments can be arranged for unattended operation, when they are operated by the train crew at intermediate crossing jeton registru or at the terminus of the line.
Token (railway signalling)
This system is widely found in Australia, where traffic density on many lines is low. In the UK it is known as the "No-signalman key token system". On the latter, the train guard not only operates the Tyer's No. The lower section is operated on the "One Engine in Steam" principle with a simple wooden staff. Possession of the staff is required to unlock the ground frame controlling the points at Coombe Junctionwhere the two sections meet.
There is no other signalling on the branch except to control entry and exit to and from the main line. Token interlinking[ edit ] After early experience with token systems, it became customary for the starting signal at jeton registru stations to be interlinked with the token instrument; on withdrawal of a token, the starting signal lever was released for one pull.
Sometimes an intermediate siding is jeton registru on the single line section, and the token itself, or a key fixed to the end of it, unlocks the points for shunting there. The token is locked in the apparatus there, and the driver cannot retrieve the token until the points have been set to the through running position and locked again. In special situations where the sidings at the intermediate location are extensive, the equipment is arranged for the shunting train to semnale euro pentru opțiuni binare put wholly inside the sidings, clear of the main line; in this situation an intermediate token instrument can be provided, enabling the driver to surrender the token so that normal through working can take place on the single line while their train is at the sidings.
A corresponding arrangement sometimes applied where permanent way maintenance was carried out by motorised trolley. Usually this used special "occupation key" instruments which were interlocked with the normal token instruments and provided at opțiuni binran places where the trolley might be off-tracked or stored overnight.
Working by pilotman[ edit ] Main article: Single-line working § Pilotman working A variation of the token system is working by pilotman, where the place of the token is taken by a person who is designated the pilotman.
This system jeton registru instituted if there is a failure of the token apparatus, a signal failure within a single line section, or on double lines when one line is blocked and traffic is to be worked in both directions over the remaining line. The pilotman identified by a red armband with "PILOTMAN" in white letters rides in the cab with the driver, or if another train is due to follow, the pilotman must issue the driver with a single line working ticket jeton registru authorise him to enter the section.
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The signalman must not clear the starting signal until instructed by the pilotman to do so. The pilotman must ride with the driver if it is the last train to run in that direction.
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Thus pilotman working is analogous to the "staff and ticket" system, described above, where the pilotman himself becomes the token and his verbal instruction is the equivalent of the ticket. It is sometimes necessary to provide the pilotman with a personal locomotive to cater for disruptions to the service. In such a case the pilotman's locomotive is usually coupled to the front of the actual train, but practice may vary depending on local track layout, types of trains etc. The use of a pilotman for such purposes pre-dates the use of tokens.
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Traditional token systems are also in use on heritage railways in Britain, for example on the Mid Hants Railway and the West Somerset Railway which is fitted throughout with Tyer's electric token instruments.
The Bluebell Railway has short section token working between adjacent boxes and long section working available between Sheffield Park and Kingscote. The token system was in use on the Hurstbridge railway lineMelbourne, Australia between Greensborough and Eltham Miniature Electric Staff and Eltham and Hurstbridge Train Staff and Ticket until replaced by electronic signalling in early The Greensborough to Eltham section was abolished on 31 Januaryalong with half of the Eltham to Hurstbridge section, as far as Diamond Creek.
The final Diamond Creek to Hurstbridge section was abolished on 22 March A temporary staff station exists at Emerald town to allow trains to pass at Emerald on busy days. For the Emerald temporary staff to be activated, the Menzies Creek to Lakeside staff is required to be locked away at Menzies Creek.
A similar situation occurs with Cockatoo station, whereby for it to be enacted as a Temporary Staff Station, the Lakeside to Jeton registru staff is required to be locked away at Lakeside.
The token method of working is sometimes still used for temporary situations such as through engineering works or where the signalling system has yet to be provided. In Decembera new underground line jeton registru opened in MelbourneAustralia which provided a circular service around the city's central business district. Although normal services were not to begin for some time, for two months special services operated on Sundays to allow people to try the new line, and for this period the line operated with a train staff, although there was no provision for tickets to be used.
A very unusual token working was instituted on the line between Pakenham and Traralgon in VictoriaAustralia for several months in whilst the line was being jeton registru.
During this period, the line was closed during the day, but opened each night to allow a few goods trains through. The line is double track between Pakenham and Moe except for a short single track section. Three jeton registru were provided for the km length, one each for the sections Pakenham— WarragulWarragul—Moe, and Moe—Traralgon.
The first two of these are partly or totally double-track sections, but the staffs in this case were applicable to both tracks, the effect being that only one of the tracks could be used at a time. The token system is still regularly used on the present-day State Railway of Thailand system. Although most use occurs in regional areas, some use appears in the capital city, Bangkok, such as the Makkasan to Khlong Tan section etc.