SP used at least four gear ratios on their F7's.
62:15 became the 'standard' freight gear ratio, and units with it were permitted 70 MPH, with the Overspeed feature set at about 72.
60:17 was the 'standard' passenger gear ratio, and those units were permitted 79 MPH, with the Overspeed set at about 83.
Both the 70 and 79 limits were higher than those recommended by EMD, but apparently SP never had any problems.
Many SP-family F units were delivered with slower 65:12 (55 MPH) gearing for freight service, or with higher 61:16 (71 MPH) gearing. Most, if not all, were converted to either the 62:15 or 60:17 gearing noted above.
Over on the Santa Fe, in 1961 the 16, 37 and 300 Classes were permitted to operate at 100 MPH, the 325 Class 80 MPH, and the 100 and 400 Classes 65 MPH. Sorry, but I'm not familiar with the gearing they used, but I suspect the 80 MPH would be 60:17 and the 65 MPH 62:15.
I don't have anything specific for Union Pacific units, but a 1956 South Central District (LA&SL) timetable simply listed the maximum speed for passenger trains as 79 and for freight trains as 60, so you can draw your own conclusions.
And finally, the last timetable I have for the Rock Island, issued March 18, 1979, lists two F7A's, 675 & 676, as being allowed 95 MPH. All of the Rock's freight F-units has bit the dust by that time.
62:15 became the 'standard' freight gear ratio, and units with it were permitted 70 MPH, with the Overspeed feature set at about 72.
60:17 was the 'standard' passenger gear ratio, and those units were permitted 79 MPH, with the Overspeed set at about 83.
Both the 70 and 79 limits were higher than those recommended by EMD, but apparently SP never had any problems.
Many SP-family F units were delivered with slower 65:12 (55 MPH) gearing for freight service, or with higher 61:16 (71 MPH) gearing. Most, if not all, were converted to either the 62:15 or 60:17 gearing noted above.
Over on the Santa Fe, in 1961 the 16, 37 and 300 Classes were permitted to operate at 100 MPH, the 325 Class 80 MPH, and the 100 and 400 Classes 65 MPH. Sorry, but I'm not familiar with the gearing they used, but I suspect the 80 MPH would be 60:17 and the 65 MPH 62:15.
I don't have anything specific for Union Pacific units, but a 1956 South Central District (LA&SL) timetable simply listed the maximum speed for passenger trains as 79 and for freight trains as 60, so you can draw your own conclusions.
And finally, the last timetable I have for the Rock Island, issued March 18, 1979, lists two F7A's, 675 & 676, as being allowed 95 MPH. All of the Rock's freight F-units has bit the dust by that time.
F7 Ustrainz Forget
SP used at least four gear ratios on their F7's.
62:15 became the 'standard' freight gear ratio, and units with it were permitted 70 MPH, with the Overspeed feature set at about 72.
60:17 was the 'standard' passenger gear ratio, and those units were permitted 79 MPH, with the Overspeed set at about 83.
Both the 70 and 79 limits were higher than those recommended by EMD, but apparently SP never had any problems.
Many SP-family F units were delivered with slower 65:12 (55 MPH) gearing for freight service, or with higher 61:16 (71 MPH) gearing. Most, if not all, were converted to either the 62:15 or 60:17 gearing noted above.
Over on the Santa Fe, in 1961 the 16, 37 and 300 Classes were permitted to operate at 100 MPH, the 325 Class 80 MPH, and the 100 and 400 Classes 65 MPH. Sorry, but I'm not familiar with the gearing they used, but I suspect the 80 MPH would be 60:17 and the 65 MPH 62:15.
I don't have anything specific for Union Pacific units, but a 1956 South Central District (LA&SL) timetable simply listed the maximum speed for passenger trains as 79 and for freight trains as 60, so you can draw your own conclusions.
And finally, the last timetable I have for the Rock Island, issued March 18, 1979, lists two F7A's, 675 & 676, as being allowed 95 MPH. All of the Rock's freight F-units has bit the dust by that time.
62:15 became the 'standard' freight gear ratio, and units with it were permitted 70 MPH, with the Overspeed feature set at about 72.
60:17 was the 'standard' passenger gear ratio, and those units were permitted 79 MPH, with the Overspeed set at about 83.
Both the 70 and 79 limits were higher than those recommended by EMD, but apparently SP never had any problems.
Many SP-family F units were delivered with slower 65:12 (55 MPH) gearing for freight service, or with higher 61:16 (71 MPH) gearing. Most, if not all, were converted to either the 62:15 or 60:17 gearing noted above.
Over on the Santa Fe, in 1961 the 16, 37 and 300 Classes were permitted to operate at 100 MPH, the 325 Class 80 MPH, and the 100 and 400 Classes 65 MPH. Sorry, but I'm not familiar with the gearing they used, but I suspect the 80 MPH would be 60:17 and the 65 MPH 62:15.
I don't have anything specific for Union Pacific units, but a 1956 South Central District (LA&SL) timetable simply listed the maximum speed for passenger trains as 79 and for freight trains as 60, so you can draw your own conclusions.
And finally, the last timetable I have for the Rock Island, issued March 18, 1979, lists two F7A's, 675 & 676, as being allowed 95 MPH. All of the Rock's freight F-units has bit the dust by that time.
F7 Ustrainz Forget
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F7 Ustrainz Forged
- Auran rail database, EMD F7, The FT class (F for freight T for 2700 hp with b-unit) proved a force to be reckoned with, hauling more freight, for less fuel and with less maintenance than any steam locomotive. Several units could be used on a train to meet horsepower requirements; this ability to.
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