See e.g.:

"UK delegation – Urban Redevelopment
Richard joined an NZCID-led delegation of 33 New Zealanders that travelled to the UK in November to look at different approaches to infrastructure. Focused on Major Urban Redevelopment, the delegation spent time in both London and Manchester. Delegates were drawn from a range of infrastructure parties, central government, local government and the private sector." (http://www.infrastructure.govt.nz/plan/newsletters/pdfs/niu-... )

"Now the task is for Governments to finalise their levels of funding commitment and the inter-agency processes for sourcing and managing an agreed investment package with co-essential monitoring processes. This is now a matter of urgency as decisions will have to be made prior to the next grain season. A new formal funding agreement binding all the infrastructure parties (including growers and existing and new entrant grain marketers) over a 10 year period should be developed. " (http://www.transport.wa.gov.au/mediaFiles/rail-freight/freig... )

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Note added at 13 mins (2015-04-02 11:35:48 GMT)
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another option would be: "infrastructure operator(s)"