Early F units usually came in set of 4, i.e., ABBA. The CB&Q found that for most trains on its mostly flat railroad ABA sets were sufficient so the ABBAs were broken into ABs with another newer A ... (more)

Early F units usually came in set of 4, i.e., ABBA. The CB&Q found that for most trains on its mostly flat railroad ABA sets were sufficient so the ABBAs were broken into ABs with another newer A... (more)

Early F units usually came in set of 4, i.e., ABBA. The CB&Q found that for most trains on its mostly flat railroad ABA sets were sufficient so the ABBAs were broken into ABs with another newer A... (more)