Since that set of articles is already fairly complete, they might serve as a good test bed for the different organizational systems we want to try.

Although its wheel size and arrangement seem far from ideal for a high-powered modern motive power unit, No. GT3 is clearly intended as far more than just another travelling test-bed.

It was taken out of passenger service in early 2013, for conversion into a test bed for the commissioning of the European Rail Traffic Management System (ERTMS) on the Hertford Loop and elsewhere.

Test bed

Meaning

Noun