[CBQ] Re: compatibility of engines

[<qrailroadman@yahoo.com>]

 All motors have electrical current levels (amperage) considered safe by the 
manufacturer. Exceeding these levels for extended periods of time will produce 
serious thermal damage to the motor. DC locomotives are given SHORT TIME 
RATINGS that indicate the maximum level of current that may be applied to the 
motor for specific periods of time. The higher the amperage, the shorter the 
time component becomes. The "weaker" unit should be the lead unit. An F7 
leading an F45 is the ideal consist since the Engineer must concern himself 
with ONLY the short time rating of the F7. In other than STALL conditions 
there’s NO way that the F45 could be damaged by loading the F7 to maximum 
current levels. Now, however, put the F45 in the lead. Loading the 45 to 
maximum current levels will VAPORIZE the F7 !!! When the higher capacity unit 
is leading the Engineer MUST be aware of the motor ratings of the lower 
capacity unit and observe them in order to prevent bringing a "crispy critter" 
into the terminal.