Maximum grade for HO 50 ton climax

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What is the maximum adverse (uphill) grade that a HO 50 ton 2 truck climax would be able to hall 3 log cars?

[WoundedBear]

Make a test ramp for yourself and find out. It's all going to depend on how heavy said log cars are.

Sid

[ebtnut]

The engine by itself is probably good for 7 or 8 percent.  I would stick to around 4 percent in order to pull a decent train.