Unfortunately, Neil Clive and Matthew were considered outdated and were sent for scrap, and since there's no Box Tanks left, I think it's safe to say none of the three were saved
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Sudrian Railway Origins: Whiff, Dane, and Neil
ActionCredit to Mainland Studios among others
Neil's Scrapping
Unfortunately, Neil Clive and Matthew were considered outdated and were sent for scrap, and since there's no Box Tanks left, I think it's safe to say none of the three were saved