[Equipment] Prototype engines for freighters have no fast variant

[TheSauron]

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Type: Equipment
Bug: Prototype engines for freighters have no fast variant
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Prototype Engine I and Prototype Engine II appear to lack the 400m/s freighter engine variant, or at the very least Barrier Gate does not have it available.

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One MD Admiral

[Groshyr]

They both exist only as 400 ms (100 cargo volume) variants on the dev version thus I call it a feature, not a bug.