Updated 31.8.04

Now available upto C/Slip No.8 of 2002

Note: You can view and also copy the required correction slip

 

LWR Manual C/S No.8 of 2002 dated

 

1.         Existing Para 1.1 & 1.2 of manual shall be reworded as under:

Para 1.1 Long Welded Rail (LWR) is a welded rail, the central part of which does not undergo any longitudinal movement due to temperature variations. A length of greater than 250 meter on Broad Gauge (BG) and 500 meter on Metre Gauge (MG) will normally function as LWR. The maximum length of LWR under Indian conditions shall normally be restricted to one block section. 

Para 1.2. Continuous Welded Rail (CWR) is a LWR which would continue through station yards including points and crossings.  

II The following may be added at the end of para 4.5.3 of the manual.  

“However, where concrete sleeper turnouts are laid, instead of three normal rail lengths, one three rail panel shall be provided between SEJ and SRJ as well as between heel of crossing and SEJ”.

LWR Manual C/S No.7. dated 15/9/2000

Following changes may be made in the figure 4.2.1(a) to (d) indicating ballast profile :

1.                    Fig.4.2.1(a) -

i)          Cross slope on formation top may be read as 1 in 40 in place of 1 in 30.

ii)         Under column (F), the figure of 6100 should be replaced with 6850 for wooden and steel trough sleepers.

iii)        Under column (F1), the figure of 5490 should be replaced with 6250 for wooden and steel trough sleepers.

2.                    Fig.4.2.1(b) -

i)          Cross slope on formation top may be read as 1 in 40 in place of 1 in 30.

ii)         Under column (F), the figure of 4880 should be replaced with 5850 for wooden steel trough and CST-9 sleepers.

iii)        Under column (F1), the figure of 5250 should be replaced with 5270 for wooden, steel trough and CST-9 sleepers.

3.                    Fig.4.2.1(c) -

i)          Cross slope on formation top may be read as 1 in 40 in place of 1 in 30.

ii)         Under column (F), the figure of 10820 should be replaced with 12155 for wooden and steel trough sleepers.

iii)        Under column (F), the figure of 11580 should be replaced with 12155 for PRC sleepers.

iv)        Under column (F1), the figure 10210 should be replaced with 11555 for wooden and steel trough sleepers.

v)         Under column (F1), the figure of 10980 should be replaced with 11555 for PRC sleepers.

vi)       Under column (J), the figure of 4725 should be replaced with 5300.

4.                    Fig.4.2.1(d) -

i)          Cross slope on formation top may be read as 1 in 40 in place of 1 in 30.

ii)        Under column (F), the figure of 8840 should be replaced with 9810 for wooden, steel trough and CST-9 sleepers.

iii)       Under column (F1), the figure of 8230 should be replaced with 9210 for wooden, steel trough and CST-9 sleepers.

LWR Manual C/S No.6 (II)

II.         Para 5.2.1 should be reworded as follows :

"The maximum daily variation of rail temperature and the mean rail temperature (t_m) for the section shall be ascertained from the temperature records available with the PWI-Incharge or as built up as per para 2.2.1".

LWR Manual C/S No.6 (I)

I.         Following may be substituted in the Existing para 2.2.1 to be read as under :-

"Para 2.2.1 : Zonal Railway should nominate 8 to 10 stations in their railway in a manner as to give the representative sample of the temperature variations on the Zonal Railway for the region allotted to each station. These stations shall be the existing PWIs offices. On these stations rail temperature records shall be built up using preferably a well calibrated continuous recording type thermometer. The maximum and minimum rail temperature for a continuous period of at least 5 years shall be ascertained and the mean rail temperature (tm) for the region arrived at. These temperature records shall be analysed to assess the probable availability of time periods during different seasons of the year for track maintenance, destressing operations and requirements of hot/cold weather patrolling etc. Rail thermometer shall also be available with each gang and sectional PWIs to enable the Gangs to work within the prescribed temperature ranges."

LWR Manual C/S No.5.

1.          New Para 4.4.1 (I) may be added as under :

"Para 4.4.1(I) In one LWR, two different rail sections are not permitted. In case of any change in rail section, LWR should be isolated by providing SEJ."

LWR Manual C/S No.4.

I.         Existing Paras 6.3(i) to (v) shall be renumbered as Para 6.3(ii) to (vi) respectively and a new para 6.3(I), as given below to be added in the Manual :

"6.3 (I) Through fittings renewal"

II.       Existing Para 6.3.1 and 6.3.2 shall be renumbered as para 6.3.2 and 6.3.3 respectively and new para 6.3.1 as given below to be added in the Manual.

"6.3.1. Through fittings renewal : Whenever it is decided to carry out through renewal of fittings so as to ensure proper functioning of LWR, the LWR shall be destressed along with the through fittings renewal.

LWR Manual C/S No.3.

1.        The heading of para 4.5.7 be replaced with `bridges with/without ballasted deck `and wherever the word "girder bridges" appears in para 4.5.7, the same be replaced with "bridges".

2.        The sentence at para 4.5.7.1 (i) (b) (i) be replaced with "ST Sleepers with elastic fastenings".

LWR Manual C/S No.2(V)

III.      A new sub para (iii) as given below be incorporated in para 1 of Annexure X B.

iii) Changes in beat length and man power deployment as given above if found necessary, may be decided by the Chief Engineer depending on prevailing local conditions, frequency of train service, weather conditions etc.

LWR Manual C/S No.2(IV)

IV.         New sub para 6.2.3 (iii) be included as given below :

`6.2.3 (iii) - In exceptional circumstances when more than 30 sleeper spaces have to be opened for any specific work, like through screening of ballast etc. during the period of the year when minimum daily rail temperature is not below t_d - 30ºC or maximum does not go beyond t_d + 10ºC, upto 100 sleeper spaces may be opened under the direct supervision of PWI. It should, however, be ensured that rail to sleeper fastenings on the entire length of LWR are functioning satisfactorily and SEJs do not indicate any unusual behaviour.

LWR Manual C/S No.2(III)

V.        Para 1.18 of Manual be substituted by the following in place of existing para :

`Para 1.18 : Consolidation of track is the process of building up ballast resistance to the tendency of movement of sleeper either initially before laying LWR of making up subsequent loss of resistance by any one of the following :

i)          For track structures consisting of sleepers other than concrete sleepers :

a)   Passage of at least 3,00,000 gross tonnes of traffic on BG or at least 1,00,000 gross tonnes of traffic on MG when compaction of ballast is done using hand operated compactors/consolidators or rammers.

b)  Passage of at least 50,000 gross tonnes of traffic on BG or at least 20,000 gross tonnes of traffic on MG or a period of two days, whichever is later, when compaction is done by means of mechanised shoulder and crib compactor.

ii)         For the track structure consisting of concrete sleepers, passage of at least 50,000 gross tonnes of traffic on BG or at least 20,000 gross tonnes of traffic on MG or a period of two days whichever is later.

iii)          At least one round of stabilisation by Dynamic Track Stabiliser (DTS).

iv)         For newly laid LWR/CWR, at least three rounds of packing, last two of which should be with on-track tamping machines.

LWR Manual C/S No.2(II)

II. Para 6.2.1(i) of the Manual be substituted by the following in place of existing para :

"Para 6.2.1 : General':

(i)  a) Track Structure consisting of other than concrete sleeper in LWR/CWR :

The regular track maintenance in LWR/CWR shall be confined to hours when rail temperature is between t_d + 10ºC and t_d - 30ºC and shall be completed well before onset of summer. If rail temperature after maintenance operation exceeds t_d + 20ºC during the period of consolidation as per para 1.18, the speed restriction of 50 Kmph on BG and 40 Kmph on MG shall be imposed when shoulder and crib compaction has been done and 30 Kmph and 20 Kmph respectively when shoulder and crib compaction has not been done in addition to posting mobile watchman.

b) Track structure consisting of concrete sleepers (not other than concrete sleepers):

The regular track maintenance in LWR/CWR shall be confined to hours when the rail temperature is between t_d 10ºC and t_d -30ºC and shall be completed well before onset of summer. If rail temperature after the maintenance operation exceeds t_d + 20ºC during the period of consolidation as per para 1.18, then the speed restriction of 50 Kmph on BG and 40 Kmph on MG shall be imposed."

LWR Manual C/S No.2(I)

I. Para 6.2 of the Manual be substituted by the following in place of existing para :

`Para 6.2 : Regular track maintenance in LWR/CWR includes the following operations :

i)                     Tamping/packing

ii)                   Lifting

iii)                  Aligning including minor realignment of curves

iv)                  Shallow screening/shoulder cleaning

v)                   Renewal of fastening requiring lifting

vi)                  Maintenance of buffer rails.