Pain Train 3 is meant to apply 100 extra Impact Landing damage, but it only does so for effects that are never actually used.
PA_ImpactLandingAggroDamageSpell, the effect that
is used by Power Armor, is missing a
PA_ImpactLandingAggroDamageEffect entry with a magnitude of 100, with "target has Pain Train 3" & "subject doesn't have Power Armor Perk" conditions.