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I've deprodded this. Chubb's C/MRI system seems to be well known to model railway enthusiasts. I found some independent discussion in railway model magazines [1][2][3]. None of it is in any great depth, but this was a quick search using "Bruce Chubb" as a search term so it indicates there may be a lot more out there in pre-internet print magazines. SpinningSpark17:38, 14 August 2022 (UTC)[reply]