I like 6414 Auto Loaders!

6465 Sunoco tank car

Milk cars!

Boat Loader

Yellow Cattle car, we only had one but it was great to play with.  Now I have two.  But the trains store has plenty

Bay window caboose.

I think it was from my 1959 NP GP set. The aquarium car was great. Noisy but great. It amazed me how the fish would wiggle. Also, IT LIGHTED UP!!  
From the same set was the fire/ladder car. A close second.
I’ve had other fun cars, but those two being from my original set makes  them my favorites.  In fact,  I like that set so much that I bought the post-war celebration set as well (even though I still have my original one).
Alan

I don't think I will pick a car.  I probably had as much fun with the gang car as any other item.

This is hard! I guess if I had to chose, it would be tank cars.

Impossible for me to pick just one - they are all perfect 😊 - well most

I’m wondering if there’s any that I don’t like 🤔

I’m kind of a fan of the 6414 Auto Loader too!

My wife votes for the 6414 Auto Loader - and she's always right!

Gee, mine too, Don

John - your wife likes Auto Loaders too?

Here's another postwar favorite - always a big hit with visitors!

Milk Cars are my favorite. I don't have one on my layout, but I want one.

I have many of those cars that were mentioned that I am going to sell...just don't know what price to ask for them.

@Don Winslow posted:

John - your wife likes Auto Loaders too?

Here's another postwar favorite - always a big hit with visitors!

No, but like your wife, Mrs. 'Ski is always right

That's what I thought John - but my wife is very supportive of my hobbies, so who's complaining?

Don't forget the postwar cabooses - here's one of my favorites!

Lionelski, great Question, great topic, I love the 3461 flat operating log cars, the 3469 coal dump cars, the Evans 6414 shape auto loader cars, the 16 inch center flat cars with the girder bridge loads, the operating barrel car, and yes the aquarium cars, all add interest to our great hobby. Lionel has hit a lot of home runs over the years with their creativity offering automated freight and passenger cars. For the 2021 volume 2 catalog, there’s an operating hobo car with sounds, Wow. Your auto carrier train looks great on your cool layout. Happy Railroading Everyone.  ( oh yes, that’s a beautiful FM Lackawanna pulling the train)

Postwar is one of the main eras of Lionel I collect, and after 9 years of collecting O scale I definitely have some favorites to list. One of them is the N5c caboose, mainly the PRR 6417. I don't have the version that is missing the "NEW YORK ZONE" lettering, but it's still one of my favorite cabooses from the Postwar era. In fact, I think the N5c is one of my favorite cabooses of all time. I currently own 6 or 7 of them across a few different manufacturers.