Locos At Thornaby Depot

Hi first time on the forum. I recently got tees valley line, while i was exploring i noticed a few locos at the thronaby depot, i jumped in the 37 i was expecting the 'wait until service' message but it didn't appear. Im wondering if the locos at the depot have services or do they just sit in the sun all day. Thanks

 

Some of them dont have Services as far as i know and are just parked there.