Want to post a reply to this topic?
Login or register for an acount to join our online community today!

"c" units

  • im doing a scince fair project and i need how fast was a "C" unit?
    LETS GO TIGERS! (clap, clap, clap clap clap )
    Replies to this thread are ordered from "oldest to newest".   To reverse this order, click here.
    To learn about more about sorting options, visit our FAQ page.
  • By "C" unit, do you mean the Fairbanks-Morse C Liner locomotive, or are you mistaking "c" for "b", such as a cabless unit?
    C280 rollin'
  • I am assuming (a dangerous thing[B)]) that a "C" unit is a cab unit. In any event, the speed capability of any locomotive with AC or DC power has their speeds determined by the gear ratio between the traction motors and the axle mounted drive gear. The rule of thumb is that a lower ratio, say 62:15, will be generally slower than the same model locomotive with, "higher" 56:21 gearing. The issue was overheating the traction motors. If an F7 unit with 62:15 gearing was running at, say 70 mph the traction motors would overheat, unless the unit slowed to a point where the motors could be kept an acceptable temperature, to prevent "frying" the motor. The trade off was that the F7 with 62:15 gearing could start a heavier train with less risk of damage from overheated motors, depending on their "short term" ratings. These generally allowed a unit to run at a slower or faster speed than normally was acceptable--but only for just so long-- with out the risk of overheating the traction motors.
  • A couple more possibilities PB, a "C" unit can be an Alco Century series or a diesel with "C" trucks (three axle all powered). The question is just too vague.
    Smile, it makes people wonder what you're up to. Chief of Sanitation; Clowntown
  • QUOTE: Originally posted by TomDiehl

    A couple more possibilities PB, a "C" unit can be an Alco Century series or a diesel with "C" trucks (three axle all powered). The question is just too vague.
    You're right about that. The question, however seems to be aimed at a science project concerning locomotives. There aren't that many young people interested in railroading. oscale trains please expand on your question. You might get a better grade on the project[;)]. in my long ago and wasted[}:)] youth I spent too much time railfanning.* But the memories of the Lehigh Valley, Erie-Lackawanna, New York Central,Penn Central and Canadian National are priceless! (* not to mention football, girls,beer,cars, The B&M,The Red Sox,beer,[:p]Central Vermont, beer.....)
  • I don't know what kind of C unit you are talking about. When I hear the word C unit I think of of the U30C or the C30-7s. These units were to run 60 miles per hour. The units were excelent pullers and with curtain units they were only geared for 55 miles per hour. These units were specifically used for the coal trains. The Milwaukee Road used these units on mixed trains and were geared for 70 miles per hour. These units would run with other c units such as the U28C and U25C. U33C and U36C were more powerful locomotives of the C units. Many railroads including the BN and Milwaukee road bought these. The two railways mentioned bought more C units than most railways. The number used in the nmae of the locomotive was the horsepower. If it was a U25C it had 2500 horsepower.

    The Milwaukee Road From Miles City, Montana, to Avery, Idaho. The Mighty Milwaukee's Rocky Mountain Division. Visit:
  • Actually, they didnt always run together, and MANY wereused in ore service.

    Are you talkign about C liners Oscale?

    Mechanical Department  "No no that's fine shove that 20 pound set all around the yard... those shoes aren't hell and a half to change..."

    The Missabe Road: Safety First