Paragraph 20 I1

In relation to any dispute arising under this Part that is referred to arbitration in accordance with article 37 (arbitration) of this Order, the undertaker will agree to any reasonable extension of time requested by Network Rail pursuant to paragraph 5(3) of Schedule 13 where Network Rail can demonstrate that it is unable (acting reasonably) to comply with the time limit due to timing constraints that may arise for Network Rail in obtaining clearance conditions and/or any engineering regulatory or stakeholder (internal or external) consents and/or assessing any matters of concern with regards to the safe operation of the railway.