I reckon a 153 would be more than sufficient
It is not practical to have a single or pair of Class 153 units in the ScotRail fleet, therefore using a Class 156 is the next best option
However, if there were other routes then it may become practical
[That is also taking into account traction knowledge]
Not that from next timetable this service swaps to a Class 158 unit
This one I find shocking, as there are other routes that would benefit from a Class 158 instead, albeit they are Glasgow North
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I was in a convo with someone (I think it was Transform Scotland, but can't be sure) and was told that there was at least talk of extending the train forwards to Stirling and backwards to Hamilton
The Motherwell - Cumbernauld service is part funded by North Lanarkshire Council
It is highly promoted for staff use (hence the over capacity at the car park at Greenfaulds)
The original proposal from the Scottish Executive (before the forming of Transport Scotland) was for a Motherwell - Cumbernauld - Stirling service
However, with the Alloa service this was dumped as paths are limited at Carmuirs / Larbert
On the plus side, such a service has been proposed to be included in the Stirlingshire (EGIP Part 2) electrification
This obviously depends on electrifying the gap between Greenhills and Coatbridge (which at present is not included)
Discussions are ongoing between Transport Scotland and North Lanarkshire Council on funding this addition