Comment by shkkmo

> We're talking about investments that range well in the tens of million of dollars. It's an insignificant drop in the bucket. The design team's salaries alone eclipse that value. On top of that, a single engine alone sells for thousands. Is this hypothetical regulatory cost that high if it can be covered by selling a few dozen units?

I think you missed the context here. Revey, the company being asked to do these certifications, doesn't make diesel engines for semi-trucks. The company makes an electric "powered converter dolly" which puts a mini trailer between the semi truck and trailer that uses batteries and electric motors to reduce the amount of diesel burnt per mile.

It's clever solution, there are externalities to consider (increased truck weight and length, changes to turning behavior, etc) but expensive certification per motor to prove that giving a truck an extra electric push doesn't increase the emissions doesn't strike me as making sense.