Image imported from derpibooru 
Original Description:
 
Featuring XR-47 Primax by Primax.
 
Mekaquestria hippoid no.3 AKA “Trackhead” turns off into hibernation mode in one of the HQ’s bays.
 
After roughly three hours into the night, the hippoid suddenly found himself in the middle of an endless expanse  
of marked asphalt and absolutely clear sky. There are no features Trackhead could take attention of, besides a large figure looming over the horizon.
 
With nothing else to do in this strange place, the robot assumed his wheeled mode to drive into the horizon as fast as he could to see whatever that unknown blob of color could explain about his predicament.  
Not much after assuming the chase, his optical receptors made a realization, the figure has begun to move towards his direction and steadily growing into view and before he knew, he came face to face with her, a giant hippoid like no one Trackhead has ever seen before.  
Her purely white cladding reflected the clean sky all over the place but that didn’t stop him to notice her aircraft wings with their corresponding jet turbines underneath as well as the dragonine tail and scaly-looking neck and belly, instead of a mane she had a pair of ornamental bulkheads on her scalp, as well as a one flailing piece attached to each ear, her cutie mark was some sort of logotype his memory doesn’t recall. Last but not least, she had a pair of robotic red eyes that stared towards his smaller being with curiosity.
 
Trackhead, at the sight of such a gigantic strange hippoid was petrified into the spot but still wanted to check out if she was threat or friend.  
The mysterious mare then slowly and carefully laid herself on the paved floor to get a closer look on her smaller find, she also spreaded her front legs way past Trackhead, something which surprised him and almost made him embrace for the worst.  
After an awkward silence, the mare began to smile in a friendly manner after a set of symbols quickly flashed upon her eyes.  
That smile made Trackhead leave behind the initial fear and as something some could consider counter-intuitive, he transformed one of his track units into a normal leg and proceeded to do a soft tap to the giant machine’s snout.
 

 
Note: The background was different at one point, initially I considered it OK to be the final version of the drawing but afterwards I decided to go against it due to errors in perspective so it was removed and replaced.  
The original can be seen here: sta.sh/01iyfrp4mlx6