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50. SEM Corrections

1. Amendment to Sub-Para 7.3.4 Existing Provision Where the block working at one end of a station is automatic and the other end is absolute, an indication board with suitable legend shall be provided at the First Stop Signal of the station. The legend on the board shall be “Entering Absolute Block Territory” or “Entering Automatic Block Territory” as appropriate. Revised Provision Where the block working at one end of a station is automatic and the other end is absolute, an indication board with suitable legend shall be provided before the Last Stop Signal of the station. The legend on the board shall be “Entering Absolute Block Territory” or “Entering Automatic Block Territory” , as appropriate. 2. Amendment to Sub-Para 17.8.1(c) Existing Provision (c) Tie Tamper shall not be used for 4 sleepers on either side of the track devices. Incidentally, they should be manually maintained. Revised Provision (c) Whenever a Tie Tamper is used, track devices shall be removed temporaril...
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Travel

 Mata vaishno Devi yatra  07 June 2025 Upto Jammu via Train After Jammu to Katra via prepaid taxi at Jammu Rly station cost 1700/-  At Katra Stayed in Hotel Jai Maa Inn. Hotel was good,located near Katra bus stand. Started for Bhavan in evening 8 pm through new route. Reached Bhavan at around 3 am next day. After Darshan started for Katra around 8 am by foot.through old route. Reached Katra Hotel around 1 pm. However New route was far better than old route. Started by train from Katra on Same Day at 9 pm
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Data

0.25 db/km- OFC loss at 1550 nm 0.40 db/km - OFC loss at 1310 nm 1 - in Month,point testing by JE/SSE 1 - in year, painting of EC sockets 1 percent- Jointing Allowance  1 km - OFC Duct length  1.2 dB - Permitted transmission loss per  km for BPAC applications  2 Months  - Stipulated time to take over new signalling installation by open Line.  2 Crore - Loss Above it is serious Accident. 2.5 Percent- Contour Allowance.  2.5 m - loop on each side for track crossing and Short bridges  3 m - Loose cable at LC gates to meet future need. 3m - Signal cable Distance in Station Section Non RE. 3 Km - Ofc drum length  3 Lakh -Serious damage to Railway property  3.15 m - thickness of MS Sheet used in Full location box. 3 Years - Painting of Signal posts 3 Years - Experience required by Graduate Engineer as per GCC. 3 m - Distance between two earth  4 years - validity of competency certificate by zonal railway. 5 dB -Sound level in waiting room...
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2. Finance and Budget

Grants - The demand for grant as finally approved by the Parliament are called Budget Grant. Appropriations (Charged) - Those sanctioned by President without reference to parliament are called Appropriations. Budget Order - Railway grants and Appropriations for a year are distributed by Railway Board to various Railway Administrations directly under Railway Board through Budget Orders. Budget Allotments -  G rants and Appropriations distributed to various Divisions and spending units are called Budget Allotments Government expenditure is divided into two parts- 1. Voted - made from consolidated fund of India  2. Charged - Charged from consolidated fund of India.  Article 113(1) - Charged Expenditure is not subjected to vote of parliament. Article 113(2) of Constitution -  Voted expenditure Abstract Estimate - For obtaining Administrative Approval  Detailed Estimate - For obtaining Technical Sanction of competent authority.Cost should not exceed Abstract Estimat...
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3.OFC

  SM fibre ( Single mode fibre)- It is a type of fibre optics cable that has smaller core diameter compared to multimode fibre. This means only a single mode of light can travel through it,resulting less signal loss and higher bandwidth. It transmits a single ray of light,which has higher bandwidth capabilities and preferred in longer distance applications. Multi mode Fibre Optic Cable- Large diameter core that allows multiple modes of light to propogate. As the core increases,more data passes through a given time. Quality of signal reduced over long distances. Typically used for short distances,data and audio/video applications in LANs. Windows of OFC - 1 st window - 850 nm - Short wavelength region 2 nd window - 1310 nm - Medium wavelength (O band) 3rd window - 1550 nm - Long Wavelength (C band) Attenuation is minimum at 3 rd window. 2nd and 3rd window are used in Single Mode Fibre. 1st and 2nd in Multi mode Fibre. Max speed of Cable laying in OFC - 15 meter/ min. Link power budg...
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4.Passenger Information System

System that facilitates dissemination of train related information to passengers are passenger Information System ( PIS) System that provides information at Railway station Premises - 1. Audio : The train related information like arrival/ departure announced through PA system. 2. Video: The information provided through video system.This is of two types. a. Interactive Video system:  It is Graphic user interface ( GUI) based touch screen directly operated by passenger to get information. These are called Passenger operated Enquiry Terminals (POET) or Touch Screen Display system. b. Non Interactive Video system - Provided train related information on CCTV monitors. These systems also display intertainment program like TV channel broadcasting. 3. Alphanumeric display systems-  Gives information in different languages on platform.This information guides the passengers to go to correct platform and in time. System that provides information at Passenger end- Two types - Interactive ...
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5. T8 B Telecom Cables

  Size of Cable - The various size of conductors used in Cable are - 0.4 mm,0.51 mm,0.63 mm,0.9 mm and 1.2 mm. Twisting is done to avoid crosstalk. Distortionless condition- If there is no phase Distortion, the velocity of propogation must be same for different Frequency components and should be independent of Frequency. GL=RC is distortionless condition  Loading of Underground cable - When diameter of conductor increases,  value of R decreases . This is not possible due to its increased cost. If the value of G increases, transmission loss will increase which is also not acceptable. Therefore there is only one way to increase the value of GL by increasing L.This is achieved by using the coils of suitable inductance value wound on dust cores are placed in series with line on suitable intervals. This is called coil loading or lump loading.Value of each coil connected in each limb of a quad cable is 59 mh. V.F.balancing of underground cable - V. F balancing of underground ca...
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