VHF Set Working Rules PDF

APPENDIX A RULES FOR THE USE AND WORKING OF V.H.F SETS (1) Rules for the use working of Wireless Sets (VHF) during Total Failure of Communications (TFC). (i) In the event of Line Communication system e.g. Block Instrument, Telephone...

APPENDIX A RULES FOR THE USE AND WORKING OF V.H.F SETS (1) Rules for the use working of Wireless Sets (VHF) during Total Failure of Communications (TFC). (i) In the event of Line Communication system e.g. Block Instrument, Telephone etc. being found defective/not working Wireless sets should be used as a means of communication for train passing work. The Station Master will “switch on” the ‘Main Switch’ of the wireless set after waiting for at least one minute for this set to worm up may be deleted and the line should start “initiating Station Master will check”. After waiting for at least one minute for this set to work up may be deleted and the line should start the initiating Station Master will check with the Station Master at the other end, the train number of three trains with their timings and Private Numbers which were passed immediately before the interruption of the communication, with a view to ensure that the correct stations are in communication. He will continue to transit his identity by pressing Pressel Switch of the HMT (telephone receiver). The Station Master at the other end as soon as he finds the Line Communication System inoperative will also “switch on” the Wireless Sets and establish the communication system. The system will remain in “switched on” condition till the line communication circuits are restored. (ii) All the train passing messages will be passed on this Wireless Communication System during this period. Permission To Approach shall be obtained with Identification Number separately for each train and all the train passing messages shall include identity of the Station Master, train number and Private Numbers etc. (iii) This is a simplex system and only one Station Master will be in a position to talk at a time. All messages will end with the term OVER and the Pressel Switch should be immediately released so that the Station Master at the other end may come on line. (iv) The frequency bands and channels to be utilized under such circumstances are – (a) Channel 5 : 160.550 MHZ (b) Channel 6 : 159.600 MHZ (c) Channel 7 : 151.400 MHZ System of working for taking Line Clear during Total Failure of Communications (TFC) : From the consideration of safety, 3 frequencies are allotted for taking Line Clear on VHF sets and programmed as channel 5, 6 and 7 in 25W simplex VHF sets provided to the stations. In cases of TFC channel 5 must be used for first 146  section, channel 6 for second adjoining section and channel 7 for third adjoining section, channel 5 for fourth adjoining section, channel 6 for fifth adjoining section and so on. Station Master should revert operation back to channel 2 after TFC is over. (2) Rules on use of Identification Number for obtaining Permission to Approach and its maintenance & issue. (Specimen sheet in annexure) (i) Two such sheets for each adjoining Block section will form the normal complement of each Block station from the date of opening. Each sheet is divided into two parts and in each part there are two columns of combinations of letters and figures. The columns in the left-half of the sheet are numbered (1) and (2) and those in the right half (2) and (1) respectively the columns bearing the same numbers are identical. (ii) The two parts of each sheet before issue will be separated, the left half of the sheet being sent to the station at one end of a Block section and the right- half to the station at the other end of the same Block section. Before issue the Sr. DOM / Sr. DOM(G)/ DOM(G) will write the names of the two stations over the two columns in each half the name of one station being written at the head of each columns bearing No (1) and the name of the other station at the head of each of the columns bearing No (2). Each half before being sent out will be signed and dated by the Sr. DOM / Sr. DOM(G)/ DOM(G) and will be placed in a sealed envelop addressed to the Station Master of the Station for which intended endorsing thereon its number and the section to which the Identification Number sheet applies. (iii) The Sr. DOM / Sr. DOM(G)/ DOM(G) will issue to each station on his division two Identification Number sheets for each adjoining block Section, each in a separate sealed envelope. One Identification Number sheet will not be used for more than one period of interruption. As soon as any of the other means of communications is restored to working order the identification number sheet that is being used during that interruption must be at once returned by both the stations to the Sr. DSO/Divisional Safety Officer and the latter will replace it by fresh sheet in a sealed cover. Note : The Sr. DOM / Sr. DOM(G)/ DOM(G) will issue five Identification Number Sheets, each in a separate sealed envelope to those stations where VHF sets are used in quick succession and there is not much time left for the station staff to send back the used Identification Number Sheets and get new sheets for subsequent use. (iv) Example – 1. Stations at either end are Kalyani and Madanpur. The Sr. DOM / Sr. DOM(G)/ DOM(G) will prepare two Identification Number sheets for the section. At the head of column marked (1) he will enter the name of Kalyani and at the head of column marked (2) he will enter the name Madanpur. Both halves of each sheet will be signed by the Sr. DOM / 147  Sr. DOM(G)/ DOM(G) and dated. Each sheet will be separated into its two parts and each part put into a separate sealed envelop on which the following endorsement will be made: “Identification Number sheet for Kalyani-Madanpur section Cover No….…” The covers containing each half of the first sheet will be numbered 1, and the cover containing each half of the second sheet will be numbered 2 and the two envelopes numbered 1 and 2 containing the right halves will be sent to Madanpur and the two numbered 1 and 2 containing the left halves to Kalyani. 2. During total interruption of communications if circumstances warrant the use of VHF sets between Madanpur and Kalyani should Madanpur desires to despatch an Up train to Kalyani he will call up Kalyani on telephone and will advise him that he is opening his sealed envelop no. 1 and instruct Kalyani to do the same. Kalyani when he as done so will call up Madanpur and ask him for his first Identification letter and figure on the list taken out of the sealed envelop. Madanpur will read out the first letter and figure shown in the column headed Madanpur Kalyani will check it with his list to see that it is correct and if so advise Madanpur as soon as he is ready to receive Is Line clear signal but Kalyani must not then read out his own identification letter and figure. Madanpur will immediately send the Is Line Clear signal for the train he wishes to despatch without either of the Station Master leaving the telephone. The enquiry message will end with the aforesaid Identification letter and figure. Kalyani will then, provided the section is clear give Permission to Approach to Madanpur over the telephone and at the end of the Line Clear message in addition to the Private Numbers he will give the first Identification Number (letter and figure) on his sheet in the column headed Kalyani which must be checked by Madanpur with his list and if found to be correct Madanpur will enter it on the Line clear Ticket in addition to the Private Numbers and will then despatch the train the subsequent Identification Numbers will be used serially for subsequent trains. Each Station Master must enter immediately in the column provided for the purpose the number and date of the train against each Identification Number used. 3. For subsequent trains in either direction each station asking for “Permission to Approach” will give the other station Identification Number in the order instanced in sub-paragraph 2 above and obtain in his turn the corresponding Identification Number along with the “Permission to Approach” from the Station Master at the other end. In this way each Station Master can satisfy himself on each occasion that the “Permission to Approach” has been asked for by and received from the correct station when “Permission to Approach” has been obtained by means of Identification numbers through the VHF sets an entry to this effect must be made in the Train Signal Register and at the top of the Line Clear Ticket at the time of issue as required by GR 14.13(2) 148 (v) When an interruption occurs and train messages are worked on the VHF sets by means of Identification Numbers, the Sr. DOM / Sr. DOM(G)/ DOM(G) must be promptly advised so that he can arrange to send out fresh Identification Number sheets without delay to replace those used. (vi) It must be clearly understood that the sealed envelope in which an Identification Number sheet is enclosed must on no account be opened till the Identification Number sheet is actually required for use. Once an Identification Number sheet is taken out of its envelope and use for an interruption the same sheet and any other sheet brought into use after the former has been exhausted will be used during the continuance of that particular interruption only, but on no account may a sheet which has been partly used be used for a subsequent interruption. As each sheet is exhausted it must be sent to the Sr. DOM / Sr. DOM(G)/ DOM(G) and any partly used sheet shall also be similarly returned as soon as the interruption is over and normal working resumed. (vii) the Sr. DOM / Sr. DOM(G)/ DOM(G) on receiving the used or partly used Identification Number sheet will arrange checking the same with its corresponding half for the section and then destroy it. (viii) The Station Master on duty is personally responsible for the Safe custody of the covers containing the Identification Number sheets and the same must be kept under lock and key. When an Identification number sheet has been once opened he must keep it in his own possession or under lock and key and make it over to his reliever only until the interruption is over so that no misuse may be made of the subsequent numbers of the sheet. 149  (Annexure) EASTERN RAILWAY Identification Number Sheet No…………………………….. No. …………………………….. No. and date of No. and date of Left half train for which Right half train for which Used used 1 2 2 1 X 40 F 85 F 85 X 40 H 21 M 7 M 7 H 21 C 3 A 15 A 15 C 3 D 9 X 36 X 36 D 9 F 16 R 82 R 82 F 16 G 14 G 99 G 99 G 14 A 26 S 50 S 50 A 26 L 90 Q 55 Q 55 L 90 M 28 T 4 T 4 M 28 Q 51 Z 49 Z 49 Q 51 ……… Sr. DOM / Sr. DOM(G)/ DOM(G)..................Sr.DOM /Sr. DOM(G)/DOM(G) Date………………………. Date………………………. Names of stations at each and of the block section to be entered at the top of columns (1) & (2) by the Divisional Safety Officer before issue. 150