Era 3 Engines
7 engines available.
Ajax is obviously a must as it's the new passenger engine and without upgrades is already equivalent to the Era2 engine. We then have the
Odin is the Era3 replica of the Boar, so there's no point in getting it unless the coupling was missed.
Dionisos is possibly even worse
Heracles is very dependant on waiting time and becomes better than Boar only around the 90/120 seconds mark, if that's what we wanted we could have got the Elephant which performs better.