test track
Noun
Meaning
(automotive) A paved track on which road vehicles can be tested.
(rail transport) A railway track for the purpose of testing trains.
Source: en.wiktionary.orgExamples
It was for a time known as the Paul Ricard High Tech Test Track (Paul Ricard HTTT).
The Mumbai Monorail is the first operational monorail network in India citation (excluding the Skybus Metro Test Track in Goa ) since the Patiala State Monorail Trainways closed in 1927.