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 temporarily. Where removal is not possible, the track devices shall be clearly marked and the details made known to the operator before commencement of work.

3. Amendment to Sub-Para 19.8.9(i)

Existing Provision

i. Crank Handle Interlocking

It shall be checked that when the crank handle is removed from its normal position in Electric Key Transmitter/other approved Relay Interlocking arrangement, the signals reading over the concerned route/zone cannot be taken ‘OFF’ nor the points can be operated from the cabin/panel. It shall also be checked that when the signal reading over the concerned route/zone is taken ‘OFF’, the crank handle cannot be released from its normal position in Electric Key Transmitter/other approved Relay Interlocking arrangement.

Revised Provision

i. Crank Handle Interlocking

It shall be checked that when the crank handle is removed from its normal position in the Electric Key Transmitter/other approved Relay Interlocking arrangement, the signals reading over the concerned route/zone cannot be taken ‘OFF’. It shall also be checked that when the signal reading over the concerned route/zone is taken ‘OFF’, the crank handle cannot be released from its normal position in the Electric Key Transmitter/other approved Relay Interlocking arrangement.

4. Amendment to Existing Item Nos. 10 & 11 – Opening of Level Crossing (LC) Gate

Existing Provision

Opening of LC Gate (Gate signal at 180 m from LC) – Delay: 60 seconds

  1. Timer shall start on putting back the gate signal.

  2. If two track circuits are provided to prove that the train has passed beyond the LC gate, such sequential proving is adequate to open the LC gate immediately without waiting for completion of 60 seconds.

Opening of LC Gate (Gate signal at more than 180 m from LC) – Delay: 120 seconds

  1. Timer shall start on putting back the gate signal.

  2. If two track circuits are provided to prove that the train has passed beyond the LC gate, such sequential proving is adequate to open the LC gate without waiting for completion of 120 seconds.

Revised Provision

Opening of LC Gate (Gate signal between 180 m and 200 m from LC) – Delay: 60 seconds

  1. Timer shall start on putting back the gate signal.

  2. If two track circuits are provided to prove that the train has passed beyond the LC gate, such sequential proving shall be adequate to open the LC gate immediately without waiting for completion of 60 seconds.

Opening of LC Gate (Gate signal at more than 200 m from LC) – Delay: 120 seconds

  1. Timer shall start on putting back the gate signal.

  2. If two track circuits are provided to prove that the train has passed beyond the LC gate, such sequential proving shall be adequate to open the LC gate without waiting for completion of 120 seconds.


Comments

Post a Comment

Popular posts from this blog

21.Telecom

                                                    Basics of Telecom Mobile Communication   Emergency Communication  Emergency Communication is provided by following means a) Emergency Socket b) 5/25 Watt VHF sets c) GSM - R ( very less percentile) d) Mobile phones available with driver, guard and staff. Emergency Socket- PT Set telephone is provided in Emergency Socket. Disadvantage of above mode of Emergency Communication - Section controller is not able to contact train crew in moving train It can be initiated only in static condition SOS facility is not available Weight of emergency control phone is fairly heavy. GSM - R is used at very less percentile. To avoid these Shortcoming MTRC ( Mobile train radio communication) is implemented. Accidents, unusual situation, robbery in train, Locomotive failure and chain pulling etc. Features of MT...
Read more

11.Data Communication & Networking

  Data Components - A data communication system has five components. 1.  Receiver  2. Sender 3. Message  4. Transmission media- Path by which message travels. Ex Twisted pair wires, Coaxial cable,fibre optic cable and radio waves 5. Protocol  Protocol is set of rules used by computers to communicate with each other across network.  Protocols can be classified as Proprietary Protocol ( specific make) Open source Protocol ( Any make). Bandwidth -  It is defined as amount of data that can be transmitted into a fixed amount of time. Usually expressed in bps ( bits per   second) Fundamental Characteristics of Data Communication   1. Delivery- System must deliver data to correct destination  2. Accuracy- System must deliver data accurately  3. Timeliness- System must deliver data in a timely manner  4. Jitter- Jitter refers to variation in packet arrival time. It is uneven delay in the delivery of audio and video packets,which r...
Read more

7.Telecom manual

  PTCC - Power and Telecommunication Co-ordination Committe. Central standing committee for co-ordination of Power and Telecommunication system. Local Telephone Equipment ( LTE). LTE is used to provide 20 local telephones at HQ. Types of cables  A) Quad Cable 0.9 mm or 1.4 mm dia. 1.4 dia Quad used for Block Section more than 12 kms. Suitable for underground laying. Used for control Circuits and block interfaces. IRS Specifications IRS: TC 30/05 B) PIJF cable-  Multi pair ( from 10 pairs to 200) Multi dia ( 0.5 mm/0.63 mm/0.9 mm) Suitable for underground laying. Used for exchange subscriber lines or branch cables branching off from main quad cable. C) Twisted Pair Switch Board Cable ( 0.5 mm/0.6 mm) Not designed for underground laying. Used for indoor applications such as distribution to various telephone subscribers in a building. Jointing Kit- For quad cable jointing- RTSF ( Reinforced Thermo Shrink Jelly Filled kit) type jointing kit to be used. Laying - Quad cable ...
Read more