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'.

Atlas O Scale Union Pacific UP F9 diesel locomotive
Atlas O Scale Union Pacific UP F9 diesel locomotive
$30.45 (5 Bids)
Time Remaining: 12h 56m
O PD WM F7A F9B Set 2 Rail C 8
O PD WM F7A F9B Set 2 Rail C 8
$647.00
Time Remaining: 17h 4m
Buy It Now for only: $647.00
ATLAS F9 Diesel Locomotive Santa Fe ATSF add FE photo
ATLAS F9 Diesel Locomotive Santa Fe ATSF add FE photo
$49.00 (20 Bids)
Time Remaining: 1d 13h 57m
Lionel CO F9 Well Car  6 16946
Lionel CO F9 Well Car 6 16946
$30.00
Time Remaining: 2d 6h 26m
Mint in Box Lionel 6 16946 Chesapeake  Ohio F9 Well Car
Mint in Box Lionel 6 16946 Chesapeake Ohio F9 Well Car
$39.99
Time Remaining: 2d 7h 3m
Buy It Now for only: $39.99
Lionel O Gauge 3840 Chesapeake and Ohio F9 Well Car 6 16946 in Original Box
Lionel O Gauge 3840 Chesapeake and Ohio F9 Well Car 6 16946 in Original Box
$39.99
Time Remaining: 3d 14h 19m
Buy It Now for only: $39.99
Lionel Pennsylvania 6983 F9 Well Car 6 16983 NIB
Lionel Pennsylvania 6983 F9 Well Car 6 16983 NIB
$39.99
Time Remaining: 5d 14h 50m
Buy It Now for only: $39.99
Early Atlas O Scale 2 Rail Train Set No6103 3 c1971 CO F 9 Freight 1970s
Early Atlas O Scale 2 Rail Train Set No6103 3 c1971 CO F 9 Freight 1970s
$26.56 (2 Bids)
Time Remaining: 6d 16h 56m
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: 7d 17h 55m
Buy It Now for only: $94.00
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
$35.00
Time Remaining: 12d 6h 45m
Buy It Now for only: $35.00
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: 14d 8h 26m
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: 21d 14h 8m
Buy It Now for only: $34.99
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
$36.00
Time Remaining: 22d 11h 23m
Buy It Now for only: $36.00
Lionel Penn Central F9 Well Car 768122
Lionel Penn Central F9 Well Car 768122
$45.00
Time Remaining: 22d 13h 36m
Buy It Now for only: $45.00
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: 29d 10h 58m
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: 29d 12h 34m
Buy It Now for only: $40.00

Other O Scale train items recently purchased through this site:

Atlas O Scale Union Pacific UP F9 diesel locomotive
O PD WM F7A F9B Set 2 Rail C 8
Mint in Box Lionel 6 16946 Chesapeake Ohio F9 Well Car
Lionel Penn Central F9 Well Car 768122
ATLAS F9 Diesel Locomotive Santa Fe ATSF add FE photo
Lionel O Gauge 3840 Chesapeake and Ohio F9 Well Car 6 16946 in Original Box
Lionel 6 16983 Pennsylvania 6983 RR F9 Well Car w ob
Lionel 6 16983 6983 Pennsylvania RR F9 Well Car NIB Brand New C 10 O scale
Early Atlas O Scale 2 Rail Train Set No6103 3 c1971 CO F 9 Freight 1970s
LIONEL TRAINS NO 16983 6983 PENNSYLVANIA RR F9 WELL CAR VERY NICE
Lionel 6983 Pennsylvania Rail Road F9 Well Car W Cable Reels 6 16983 1997 C 9
Lionel Pennsylvania 6983 F9 Well Car 6 16983 NIB
Lionel CO F9 Well Car 6 16946
LIONEL 16318 LL FLATCAR 16929 BC GONDOLA 16946 CO F9 WELL CAR ALL W REELS
LIONEL TRAINS 6 16983 PENNSYLVANIA RAIL ROAD F 9 WELL CAR WITH CABLE REELS
LIONEL 6 16946 Chesapeake Ohio F9 Well Car NIB 14 in FREE Ship Lower 48 States