Often, when a new locomotive arrives, I give er the once over; including, rail trials(like sea trials for ships); and then, I keep my distance, from the new addition. It's not that I don't like "it" it's more a type of savoring... a kind-of willful reluctance... over protectiveness... let it reign with it's special "new" status; it will be one of many... soon enough.
A few days ago, I got a beautiful new MTH Premier scale wheels Canadian Pacific FM H24-66 Train Master; spectacular. The 24-66 is sitting on the layout, it's had it's initial rail trials... and it's resting up... basking in the lime light. My previous new purchase, from a few months ago, a gorgeous Premier 3.0 UP SD70ACe - finally moved off new arrival status. It's only got a little over 6 scale miles logged; and, the ACe looked great - stretching it's legs. UP's colors look great on this standout, modern, EMD model; quite the machine!
That's my way of doing things... when they're new.
Rick