I have a lovely example of the above (Clan Line), and am aware that these locos can suffer from a split idler gear. Although mine runs perfectly I am concerned that the idler gear will fail, trouble is, there are no replacements available,and no way of knowing if they ever will be. I have pre ordered both types as I don’t know which type of gear I have, Does this weakness apply to every Merchant Navy/West Country etc model produced? Do these sort of spares eventually become available? I really love this loco, and don’t want it to become unusable. Thanks