What about gear ratios?

[jrbernier]

EMD’s ratings for F7 starting TE were as follows:

65:12 85,000

62:15 64,600

61:16 59,600

60:17 55,200

59:18 51,200

58:19 47,800

57:20 44,600

56:21 41,800.

However it qualified the five highest ratings by stating that those TE levels would only be attained if rail conditions were “favorable”.

Considering that most F7’s weighed about 120-124 tons - that would put about 60,000 lbs of Starting TE at 25% adhesion. One would need very ‘favorable’ dry rail to get this kinds of TE. Of course, all bets are off until you reach the minumum continuous speed of the engine so you do not fry the electrical system! I can smell the electrical insulation …

Jim

[JayPotter]

Considering that most F7’s weighed about 120-124 tons - that would put about 60,000 lbs of Starting TE at 25% adhesion. One would need very ‘favorable’ dry rail to get this kinds of TE.

EMD’s calculations were based on a unit weight of 115 tons.