Tender wheel markings
Since many years I have markings on all tender wheels. During a loco run they help to see if all wheels/axles are turning and nothing is blocked. White markings would be best, but black is unobtrusively and still visible. I used Humbrol colour.
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Experience counts - this is a problem that we know will occur at some point during the life of a loco so this is a useful tip to help prevent a problem before it happens.