(24 Jun 2022, 3:15 pm)ASX_Terranova wrote I want to a livery based on Northern Spirit and was wondering if anyone had done train liveries on buses before?

There's been a few.

Virgin Trains ExpressCoach
Midland Mainline (Corby rail link)
South West Trains (for rail replacement)
ScotRail (Glasgow station link)

Arriva Sapphire was also recycled from Arriva Trains Wales livery, which itself was recycled from a trial livery used by Arriva Scotland West.