334s still have Route Clearance for Inverclyde and the Circle (including Neilston) but the issue would be driver traction knowledge. I ended up having to divert a 334 off a Larkhall into Central High Level a few months ago and ScotRail struggled to get someone to shift it for a couple of hours afterwards, eventually they sent a spare Motherwell man through.
Id thought a 334 could come on Glasgow - Lanark service now and then .