# The Railways (Interoperability) Regulations 2011, Paragraph 2.3


Control-command and signalling
(2.3.1) Safety
The control-command and signalling installations and procedures used must enable trains to travel with a level of safety which corresponds to the objectives set for the network. The control-command and signalling systems should continue to provide for safe passage of trains permitted to run under degraded conditions.
(2.3.2) Technical compatibility
All new infrastructure and all new rolling stock manufactured or developed after adoption of compatible control-command and signalling systems must be tailored to the use of those systems.
The control-command and signalling equipment installed in the train drivers’ cabs must permit normal operation, under the specified conditions, throughout the rail system.

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Source: https://www.legislation.gov.uk/uksi/2011/3066/schedule/2/paragraph/2.3 (the official version)
Page: https://openlegislation.uk/railways-interoperability-regulations-2011/schedule-2/paragraph-2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.