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'.

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
$59.00
Time Remaining: 15h 48m
Buy It Now for only: $59.00
Lionel new 6 16946 Chesaapeake  Ohio F9 well car
Lionel new 6 16946 Chesaapeake Ohio F9 well car
$40.00
Time Remaining: 3d 8h 34m
Buy It Now for only: $40.00
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: 9d 13h 6m
Buy It Now for only: $39.99
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: 13d 9h 52m
Buy It Now for only: $44.95
Lionel Pennsylvania 6983 F9 Well Car 6 16983 NIB
Lionel Pennsylvania 6983 F9 Well Car 6 16983 NIB
$39.99
Time Remaining: 22d 11h 56m
Buy It Now for only: $39.99
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: 26d 10h 18m
Buy It Now for only: $38.95
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: 28d 12h 24m
Buy It Now for only: $49.00
Lionel 6 16983 6983 Pennsylvania RR F9 Well Car NIB Brand New C 10 O scale
Lionel 6 16983 6983 Pennsylvania RR F9 Well Car NIB Brand New C 10 O scale
$40.00
Time Remaining: 28d 13h 59m
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: 29d 17h 5m
Buy It Now for only: $94.00
LIONEL F3  ORIGINAL PORTHOLES  9 RARE EYELIDS    F9
LIONEL F3 ORIGINAL PORTHOLES 9 RARE EYELIDS F9
$63.00
Time Remaining: 29d 18h 18m
Buy It Now for only: $63.00

Other O Scale train items recently purchased through this site:

Lionel new 6 16946 Chesaapeake Ohio F9 well car
LIONEL F3 ORIGINAL PORTHOLES 9 RARE EYELIDS F9
LIONEL TRAINS 6 16983 PENNSYLVANIA RAIL ROAD F 9 WELL CAR WITH CABLE REELS
Lionel 6 16983 6983 Pennsylvania RR F9 Well Car NIB Brand New C 10 O scale
Lionel Pennsylvania 6983 F9 Well Car 6 16983 NIB
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
Lionel 6 16983 Pennsylvania 6983 RR F9 Well Car w ob
Lionel 6983 Pennsylvania Rail Road F9 Well Car W Cable Reels 6 16983 1997 C 9
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