We've searched the internet and found the largest collection of O Scale trains for sale is on eBay. Below are the listings for 'F9'.

LOT OF FOUR VINTAGE O SCALE F7 F9 LIONEL DIESEL ENGINES POST WAR
LOT OF FOUR VINTAGE O SCALE F7 F9 LIONEL DIESEL ENGINES POST WAR
$150.00
Time Remaining: 1d 21h 2m
Lionel CO Chesapeake  Ohio F9 Well Car 6 16946
Lionel CO Chesapeake Ohio F9 Well Car 6 16946
$45.99
Time Remaining: 1d 21h 34m
Buy It Now for only: $45.99
Bethlehem Steel Lionel F9 deep well car with Sparrows Point propeller load
Bethlehem Steel Lionel F9 deep well car with Sparrows Point propeller load
$69.00
Time Remaining: 5d 3h 31m
Lionel 6 16983 Pennsylvania 6983 RR F9 Well Car w ob
Lionel 6 16983 Pennsylvania 6983 RR F9 Well Car w ob
$44.95
Time Remaining: 8d 1h 4m
Buy It Now for only: $44.95
LIONEL 6 16946 Chesapeake  Ohio F9 Well Car NIB 14 in FREE Ship Lower 48 States
LIONEL 6 16946 Chesapeake Ohio F9 Well Car NIB 14 in FREE Ship Lower 48 States
$34.99
Time Remaining: 15d 6h 47m
Buy It Now for only: $34.99
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
$38.95
Time Remaining: 19d 23h 18m
Buy It Now for only: $38.95
Lionel new 6 16946 Chesaapeake  Ohio F9 well car
Lionel new 6 16946 Chesaapeake Ohio F9 well car
$40.00
Time Remaining: 20d 22h 26m
Buy It Now for only: $40.00
LIONEL 16318 LL FLATCAR 16929 BC GONDOLA  16946 CO F9 WELL CAR ALL W REELS
LIONEL 16318 LL FLATCAR 16929 BC GONDOLA 16946 CO F9 WELL CAR ALL W REELS
$94.00
Time Remaining: 22d 10h 3m
Buy It Now for only: $94.00
Lionel 6983 Pennsylvania Rail Road F9 Well Car W Cable Reels 6 16983 1997 C 9
Lionel 6983 Pennsylvania Rail Road F9 Well Car W Cable Reels 6 16983 1997 C 9
$49.00
Time Remaining: 23d 3h 36m
Buy It Now for only: $49.00
LIONEL TRAINS 6 16983 PENNSYLVANIA RAIL ROAD F 9 WELL CAR WITH CABLE REELS
LIONEL TRAINS 6 16983 PENNSYLVANIA RAIL ROAD F 9 WELL CAR WITH CABLE REELS
$39.99
Time Remaining: 24d 4h
Buy It Now for only: $39.99
LIONEL F3  ORIGINAL PORTHOLES  9 RARE EYELIDS    F9
LIONEL F3 ORIGINAL PORTHOLES 9 RARE EYELIDS F9
$70.00
Time Remaining: 24d 9h 31m
Buy It Now for only: $70.00
Lionel Pennsylania RR f 9 well car 6 16983 built in 1997 for boysorgirls unused
Lionel Pennsylania RR f 9 well car 6 16983 built in 1997 for boysorgirls unused
$69.00
Time Remaining: 25d 3h 41m
Buy It Now for only: $69.00

Other O Scale train items recently purchased through this site:

LIONEL F3 ORIGINAL PORTHOLES 9 RARE EYELIDS F9
Lionel 6983 Pennsylvania Rail Road F9 Well Car W Cable Reels 6 16983 1997 C 9
Lionel CO Chesapeake Ohio F9 Well Car 6 16946
LIONEL TRAINS 6 16983 PENNSYLVANIA RAIL ROAD F 9 WELL CAR WITH CABLE REELS
Lionel 6 16983 Pennsylvania 6983 RR F9 Well Car w ob
Lionel new 6 16946 Chesaapeake Ohio F9 well car
LIONEL 6 16946 Chesapeake Ohio F9 Well Car NIB 14 in FREE Ship Lower 48 States
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
Bethlehem Steel Lionel F9 deep well car with Sparrows Point propeller load
LOT OF FOUR VINTAGE O SCALE F7 F9 LIONEL DIESEL ENGINES POST WAR
LIONEL 16318 LL FLATCAR 16929 BC GONDOLA 16946 CO F9 WELL CAR ALL W REELS
Lionel Pennsylania RR f 9 well car 6 16983 built in 1997 for boysorgirls unused