If u are monitor then first confirm member's wait listed entry of same update instead of making own update. To Check timeline WL entries first n then update own if reqd.
When u want to update something latest info ...then just go thru train's timeline entries n check at least 2..3 pages for WL entries. If u find same update which u are going to do is already in waiting list then do confirm that n avoid yours as someone has done it before you. You just need to confirm it after verifying.
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