- Subject to a time limit.
- 2020 April 8, “Network News: COVID-19: Questions and Answers”, in Rail, page 11:
- What will happen to PRM-TSI deadlines?
[...] The dispensations granted after December 31 2019 are time-limited and apply to around 1,500 vehicles. If problems with the supply of new rolling stock and refurbishment of existing trains become severe, it is possible they could be extended.