Any of my Stewart F7s, either in freight or passenger colors – just love to see them pulling a string of cars around the track (or at least the portion that’s laid so far [:P]). I’m also fond of two Atlas/Kato GP7s I’ve had for almost 10 years, which still run like Swiss clocks on their newish DCC decoders.
My Atlas GP40 in Chessie paint, rock pilot an all. Well all my atlas’ run great, I just love the GP40. So where’s the late phase GP40-2, enough already w/ the 38’s from everybody.
Bob K.
I’d say my two brass Akane ex-Missabe Yellowstones right off the bat, they’re both about 40 years old, but they’re big, powerful beauties and run like Swiss watches. After that, I’d definitely go for my chunky little brass 2-8-0’s, one a PFM Santa Fe 1850 series (the first brass loco I ever bought) and the other a cute little Rio Grande 1100 series. But when you come down to it, I love ALL my locos–and I run them. Otherwise I wouldn’t have bought them.
Tom
My favs?
Steam
My AHM Virginia & Truckee 4-4-0 my Dad gave to me. It’s older than me & my Mom gave it to him as a gift back in the 60’s
Diesel
My Proto 2000 Alco D&H PA & my Athearn RTR Canadian Pacific AC4400
The PA my wife actually let me buy (WOO HOO!!!) & the AC4400 I bought with inheritance from my Mom last year.
Gordon
best looking steam would be my sunset brass,nyc,k5…best running is a bachmann 2-8-0
in diesel - my brand new overland FL9.My BLI engines are a close second and I usually enjoy running engines that I built or super detailed.
My Atlas Rock Island U30Cs run and look great pulling one of my 60 car unit grain trains. Second favorite engine is my brass Precision Scale Southern Pacific SD45T-2 I had custom painted.
Cab Forward, both real and my HO version.
Way cool articulated loco.
Tim
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all of them
My Atlas S-3 (actually one of the older Austrian S-4’s with an aftermarket S-3 hood casting) that I have painted and detailed to (almost) match a favorite prototype. Plus I added sound last year, which has made a real improvement.
Tom
I’d have to say my old Tyco RF16 in Johnson Wax colors.
Ducks flying tomatoes
But seriously, my late grandfather gave me that engine well over 20 years ago. I’ve only seen one other like it. The last time he saw it was in 2001, shortly before he died. He’d forgotten all about it until I showed it to him. He smiled and went to sleep…then died a week later 
Even though that engine no longer runs very well, it still has a place of pride on my railroad.
My 21 year old Lima British Rail class 87 electric is probably my favourite or is it my Conrail E33 electric? Either way my heavy electrics get my vote.
Well, if I could choose a favorite I wouldn’t have so many [:D]
Really? Which one? I got a “Reno” for my 9th birthday. It was the first new locomotive that was actually my own and not a hand-me-down. This was back when Rivarossi was still putting brass details on. I also got an MRC “Ampack” power pack. Still have both of them, only wish I still had the original box for the 4-4-0.
Since then I’ve collected at least one copy of the entire V&T fleet that AHM made. Reno, Inyo, Genoa, and Bowker.
I guess I’d have to go with my Stewart CNW C-628. It’s very powerful and smooth running plus I put a Soundtraxx sound decoder in it. It’s the same engine as featured on the cover of Eric Hirsimaki’s “Chicago & North Western: The Michigan Ore Lines”.
My personal favorite is a brass Baldwin 0-8-0T (class of 1897,) purchased as a kit in Japan about 40 years ago and since detailed to be suitable for operation in 1964 (about 40 years after the prototype was scrapped.) The little bandit can outpull a couple of my 2-8-2’s and holds its own with my DD13 class diesels.
Chuck
Without a doubt it has to be my outside frame Consolidation from Bachmann. I have this model in both Fn3 and On30 scales, and both are wonderful examples of what can be done with plastic and metal in an affordable package. Both locomotives are very good pullers, and while the Fn3 version has a lot more detail, the On30 version is still one of the most detailed models I’ve seen compared with anything near it’s size.
My second favorite would probably be the MMI On30 K27. While as detailed as the Bachmann, it’s more brass like running performance and required a lot of work to get up to snuff and the stock sound system was a nightmare to deal with. Beyond that, it’s still a Mudhen and beautiful!
Jeff
In N my favorite steam is my NYC shrouded hudson with boxpox drivers, runs great and looks great. Diesels got to be my custom bodied sharks in my home road liverly of coach green and black.
Radioman2
I think my favorit out of my collection would be my walthers SP GP9. its not a very good model, but i love SP’s GP9s and their low hood ones espeicaly. Its currenly compleatly taken apart since im makeing some new lighting circuits for it. Other than that one i really like my stewart U25Bs and my Walthers H12-44 =)
~matt
Mine would be my Santa Fe Atlas Dash 8-40CW. Man, do Atlas engines rule! Then it dropped out of my hands one late night while trying to do a little detail work, but sure enough, the sucker was built tough and nothing broke. Just goes to show that you should keep the late nights to a minimum or bad things happen.
Wabash PA from Kato