[Subset 026] : ERTMS/ETCS System Requirements Specification, ERA, UNISIG, EEIG ERTMS USERS GROUP (Issue 3.6.0)
[Subset 026-3] : ERTMS/ETCS System Requirements Specification, Chapter 3: Principles, ERA, UNISIG, EEIG ERTMS USERS GROUP (Issue 3.6.0)
[Subset 026-6] : ERTMS/ETCS System Requirements Specification, Chapter 6: Management of older System Versions, ERA, UNISIG, EEIG ERTMS USERS GROUP (Issue 3.6.0)
[Subset 026-7] : ERTMS/ETCS System Requirements Specification, Chapter 7: ERTMS/ETCS language, ERA, UNISIG, EEIG ERTMS USERS GROUP (Issue 3.6.0)
[Subset 034] : ERTMS/ETCS Train Interface Functional Interface Specification, ERA, UNISIG, EEIG ERTMS USERS GROUP (Issue 3.3.0)
[Subset 040] : ERTMS/ETCS Dimensioning and Engineering Rules, UNISIG (Issue 3.2.0)
[Subset 041] : ERTMS/ETCS Performance Requirements for Interoperability, UNISIG (Issue 3.2.0)
[Subset 119] : ERTMS/ETCS Train Interface, Functional Specification, ERA, UNISIG, UNIFE (inofficial draft)