Talk:RR3 Wiki:Upgrade Strategy Limited Time Series/@comment-2401:4900:261D:49C7:5C9:82B1:F22B:FEAE-20180821072411/@comment-32545704-20180821075106

-2 engine means all engine upgrades except the last two

-1 drivetrain means all drivetrain upgrades except the last one

Etc.