For section 7 of the Principal Act substitute —
(1) Subject to subsection (2), any of the following classes of work is "rail safety work "for the purposes of this Act—
(a) driving or despatching rolling stock or any other activity which is capable of controlling or affecting the movement of rolling stock;
(b) signalling (and signalling operations), receiving or relaying communications or any other activity which is capable of controlling or affecting the movement of rolling stock;
(c) coupling or uncoupling rolling stock;
(d) maintaining, repairing, modifying, monitoring, inspecting or testing rolling stock, including checking that the rolling stock is working properly before being used ;
(e) installation of components in relation to rolling stock;
(f) work on or about rail infrastructure relating to the design, construction, repair, modification, maintenance, monitoring, upgrading, inspection or testing of the rail infrastructure or associated works or equipment, including checking that the rail infrastructure is working properly before being used;
(g) installation or maintenance of—
(i) a telecommunications system relating to rail infrastructure or used in connection with rail infrastructure; or
(ii) the means of supplying electricity directly to rail infrastructure, any rolling stock using rail infrastructure or a telecommunications system;
(h) work involving certification as to the safety of rail infrastructure or rolling stock or any part or component of rail infrastructure or rolling stock;
(i) work involving the decommissioning of rail infrastructure or rolling stock or any part or component of rail infrastructure or rolling stock;
(j) work involving the development, management or monitoring of safe working systems for railways;
(k) work involving the management or monitoring of passenger safety on, in or at any railway;
(l) any work in relation to ensuring the safety of—
(i) rail safety workers on a railway;
(ii) any persons working on or near a railway, whether or not the person working on or near the railway track is carrying out rail safety work;
(m) any other work that is prescribed by the national regulations to be rail safety work.
(2) For the purposes of this Act, rail safety work does not include any work, or any class of work, prescribed by the national regulations not to be rail safety work.".