| 摘要 |
Ducting associated with rail track comprising a bed (13) located along at least a portion of the length of the rail track, the bed lying proximate the rails (11), a resiliently deformable cover (27) receivable over the bed and comprising a plurality of elongated channel members located in an end to end relationship having their flanges (29) extending downwardly and outwardly, the cover being intended to cooperate with the bed to define a duct able to accommodate conductors, optical fibres, cable and services. The bed has retention means (21) in the form a groove to receive and retain the lips (31) of the channel members. An apparatus having a carriage (73) is movable along the rail track to cause inward resilient deformation of the cover by pairs of rollers (71) to enable installation and withdrawal of the lips (31) from the grooves (21).
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