@Running-Away Per page 22 of the rulebook, units of another power may be transported only if that power is friendly. Per page 12, the US is not considered to be either friend or enemy to any other power while it remains neutral. Therefore, the US cannot transport units belonging to any other power while it is neutral.
[1914] New Units?
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What custom units would/have you added to 1914?
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Our club has added technology rules that really speed up the game and offer much more variety. One of the most significant is that each country has rail movement. If you want to discuss, best way to reach me is by email at jonkrost@comcast.net