43A.—In sections 43B to 43F—

"environmental condition", in relation to a railway order, means any condition, modification, restriction or requirement to which a railway order is subject that relates to—

(a) features of the railway works or measures envisaged to avoid, prevent, reduce or offset significant adverse effects on the environment, or

(b) the monitoring of significant adverse effects on the environment (including conditions regarding monitoring measures, parameters to be monitored and the duration of monitoring).]