Thanks to everyone who particpated in the Second Survey. The results were compiled from over 50 votes for many different locomotives, motorized units and even a stationary crane.
Over half the votes were for various Lionel Lines items, proving the Lion reserves some of the most fragrant designs for the house label. The submissions were made June 2001 through August 2002.
See the results of our First Survey here

The Second Survey question was:

What do you run for Ozone?

First Place
The winner is the Postwar F3. Most of these voters indicated the Santa Fe version, with Southern, NYC, and CP also mentioned. The illustration is from the cover of the 1952 Lionel catalog. Comments from submitters to the survey about this diesel classic include:
"Memories started in 1950 when I was a kid. Still am."
"Dual motors make plenty Ozone!"
"More Ozone with 2 motors than all the modern Pulmores I own combined."

Second Place
The favorite steamer choice was the Postwar 671 Turbine, in both Lionel Lines and Pennsy road names. The illustration is from the cover of the 1948 Lionel catalog. Comments from submitters to the survey about this 6-8-6 steamer include:
"Great runner, Good fresh smell."
"DANG! Get a Whiff of that!"
"Champion Lionel ozone buster of all time."

Third Place
The popular GP-7/GP-9, in various road names, came in third place. The roadnames mentioned included Milwaukee Road (pictured), Burlington, SP, and Wabash. The photo is from the 1998 Volume 2 catalog. Comments from submitters to the survey about these include:
"Looks good, runs good, Smells Gooooood."
"My first LIONEL; used to be my uncle's."
"I put all of these bad boys together on the head of a long freight = OZONE!"

Fourth Place (tie)
The rugged and bouncy #50 Gang Car, with its exposed Pulmore motor, tied for fourth place. The illustration is from the cover of the Gang Car's Operating Instructions. Comments from submitters to the survey about this ever-popular motorized unit include:
"Ozone permeates the air in no time."
"Incredibly ozone oderiferous!"
"I think it is all the sparking under the gang car - OZONE!"

Fourth Place (tie)
Another favorite steamer is the Lionel Lines 726 Berkshire made both in the Postwar period and as a modern reproduction. The illustration is from page 4 of the 1996 Lionel Century Club catalog. Comments from submitters to the survey about this 2-8-4 steamer include:
"Smells great."
"This engine shoots perfect smoke rings, runs great."
"Beautiful engine that sounds amazing!!"