Happy New Year everyone. I have just discovered The Gauge and am eager to become a regular. I have been away from the hobby for 10 years and am now working on getting my basement layout operational. I am still learning the jargon and am hoping someone can help me with a quick question about terminology for diesel locomotives. I am confused about the difference between F3A, F7A and C-liner. I suspect this will categorize me as a newbie, which would be about right.