It is the Mobility Test Rig undergoing its Accelerated Life Testing, designed to demonstrate reliability and provide test data the MTR in the video above covered 300km and towed the 92 tonne vehicle train.
More recently, the MTR has undergone low temperature testing the INSTITUTO TECNOLÓGICO ‘LA MARAÑOSA’
The tests included a 72 hour period at -32 degreec C followed by a series of starts using a pre heater and no pre hetear.
By conducting the tests in Spain, General Dynamics is obviously keeping to their stated strategy of keeping FRES ‘British to its Bootstraps’
I mean its not like we have this kind of facility in the UK or anything.