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R A I LT R AC K - The Railways Archive

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outputs<br />

5.5 continued<br />

Permitted axle weights<br />

<strong>The</strong> maximum axle weights<br />

that the current network can<br />

carry vary according to the<br />

engineering characteristics of<br />

each route, particularly of the<br />

underline bridge and viaduct<br />

structures.Axle-weight limits<br />

are classified into Route<br />

Availability (RA) values<br />

between 1 and 10,of which<br />

the key groupings are:<br />

RA 1–6 up to 20.3 tonnes<br />

RA 7–9 up to 23.4 tonnes<br />

RA 10 up to 25.4 tonnes.<br />

<strong>The</strong> current networ k<br />

availability for these axle<br />

weights is shown here.<br />

Up to RA6<br />

RA7–9<br />

RA10<br />

Unclassified/mothballed<br />

AXLE WEIGHTS 1998/99 1999/2000 20001/01 2005/06 2008/09<br />

km of track up to 20.3 tonnes 2725 2725 2727 2729 2729<br />

km of track 20.4 to 23.4 tonnes 14729 14729 14695 14617 14617<br />

km of track 23.5 to 25.4 tonnes 13392 13392 13400 13516 13541<br />

TOTAL 30846 30846 30822 30862 30887<br />

Note: <strong>The</strong> data shown in the table differs from that which we published in the 1998 NMS and is more accurate.<strong>The</strong> forecasts in this table are based upon both the maintenance and renewal<br />

expenditure and the completion of enhancement schemes set out in this NMS.<br />

58

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