RARE: TOKEN EXCHANGE "THE OLDEST RAILWAY SIGNALING SYSTEM" - INDIAN RAILWAYS !!

5 in 1 !! Token Exchange & EMD Acceleration Show !! Here, I Present the Oldest Railway Signaling System in Indian Railways, Hit the Like button if u all Like them and S-U-B-S-C-R-I-B-E for More Video's !! --------------- Channel Link: https://www.youtube.com/c/TheRailStudio --------------- Maybe These QA Help u knowing about the Oldest System in Indian Railways !! |---|----|----| Q. What's a token system or a tokenless system? A token block system uses a physical item (the token) of some sort, such as a ball as in the Neale's Ball token system (see below), which is physically carried or manipulated in some way to indicate permission for a train to enter a block of track. A tokenless system, such as may be obtained by a combination of interlocking and semaphore signals, does not require the train crew to carry or manipulate anything tangible to enter or leave a block of track; they follow the signals and interlocking handles the rest. (There are also token systems where the 'token' is an electronic radio signal with a code on it that is transmitted to the loco; such systems are not in use in India. E.g., Radio Electronic Token Block working in the UK.) |~-~-~-~-~-~-~-~-~-~-~-~-| Q. What kinds of block instruments are or were used in India? In India, the most prevalent form of physical token system to be found in recent decades is the Neale's Ball Token System and variants such as Neale's Voucher Block, Neale's Tablet Token, etc. Other systems such as Theobald Key Token, Webb and Thompson electric token staff, Tyer & Co.'s key token instrument (one-wire three-position instrument and others), etc., were also widely used. Robert's Key Staff instruments were used to control single lines on the Mysore State Rly. and the Madras and Southern Mahratta Rly. Neale's Ball Token came into wide use in the interbellum years just before Independence. Mr Neale, by the way, was an engineer on the GIPR. Most early block instruments followed British designs and practices. Neale's token system was innovative when it was introduced, as it combined, for the first time, the token handling system with the block instrument operation into a single system. Tokenless block instruments aim to do away with the time-consuming process of manually exchanging tokens. Tokenless operation on single lines is more recent, having started in the 1970s. Among tokenless systems used today by IR, common types of block instruments include push-button tokenless single-line block instruments made by the Signal & Telecom Workshops of SR at Podanur, Diado single-line tokenless instruments, Kyosan single-line tokenless instruments, etc. Tokenless working of double line sections is much older, because of the inherent safety factor of not having to worry about opposing train movements on the same line. For double-line sections, tokenless instruments made by a collaboration between Siemens (Germany) and General Electric Co. (UK) were in wide use; these are still known as 'SGE' instruments although they are now manufactured at the Podanur workshops. There are also the so-called Double Line Lock and Block instruments (see below for Lock and Block working) which rely on a mechanical route-blocking arrangement activated by the presence of a train, (the wheels depressing a treadle that activates the interlocking to ensure only one train is on a block section at a time — or indeed, even achieving interlocking between signals under the same cabin). Early on different kinds of Lock & Block instruments were in use on heavy-traffic lines in India; instruments were from Sykes & Co. and other manufacturers. |~-~-~-|-~-~-~-| Q. What happens if lots of trains go in one direction in a section that uses physical tokens, and one station then runs out of tokens? There is a problem if the traffic is not symmetric in both directions between the two stations at the ends of a block section. Eventually, one of the stations will run out of tokens to dispense to trains. This condition is known, not surprisingly, as a token exhausted condition, and results in all traffic in that direction being suspended until tokens (recovered from the other station) can be refilled in the empty block instrument. In order to avoid this situation, every so often (depending on the traffic), tokens are taken from the station that is receiving an excess of them and returned to the other one (which is dispensing more than it receives); this is known as token balancing. Source :-IRFCA |~-~-~-~-|-~-~-~-| Watch Video's in 1080P Full-HD : https://www.youtube.com/c/TheRailStudio RARE: LADY LOCO PILOT DRIVING SHATABDI EXPRESS - https://youtu.be/h_pnPzyjk1A |-~-~-~-~|-~-~-~-| S-U-B-S-C-R-I-B-E FOR MORE VIDEO'S !! #token #tokenexchange #railway #railwaysignalingsystem #indianrailways #irfca #locopilots #shatabdiexpress #rare #loco #locomotive #therailstudio