This may not qualify being both a diverted service and a Sprinter/Pacer combination, but I did travel on a 158/bus seat 142 that ran non-stop from Hebden Bridge to Leeds via Dewsbury, 28miles in 30mins, running fast through the 9 intermediate stations.
I of course sat in the 158, not the bat out of hell Pacer.
I of course sat in the 158, not the bat out of hell Pacer.