### Instruction:

Extract the cause and effect entities from the following sentence:
The EIRENE Functional Requirements Specification defines a set of requirements which a railway radio system should comply with, in order to facilitate international interoperability between national railways and manufacturing economies of scale

### Assistant:

KEYWORD: which
CONDITION: should comply with
VARIABLE: a railway radio system
EFFECT_1: to facilitate international interoperability between national railways and manufacturing economies of scale
CAUSE_2: a railway radio system should comply with
CAUSE_1: The EIRENE Functional Requirements Specification defines a set of requirements

