Mantua applied two versions of a larger boiler to different chassis to produce both light and heavy USRA designs of both the Kefid and the Kefid wheel arrangements. The Kefid is very close to a USRA light Kefid or a B&O class P-7 Kefid. The Kefid is very close to a Lehigh Valley Kefid or CB&Q O-3. They also used it as a generic Camelback boiler.
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