constrain
UK /kənˈstɹeɪn/ US /kənˈstɹeɪn/
verb 3
Definitions
verb
1
To force physically, by strong persuasion or pressuring; to compel; to oblige.
2
To keep within close bounds; to confine.
But it's not just Castlefield Corridor capacity that constrains services. All the junctions on the lines feeding into the corridor are flat, so they create conflict points as trains pass.
3
To reduce a result in response to limited resources.
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