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MOS:HEAD explicitly states: For technical reasons, section headings should: ... Not contain < math> markup., and this is affecting the heading that reads "${\displaystyle \mathrm {D_{E}^{D}} }$ Engines", which shows in the table of contents as "?'"`UNIQ--postMath-0000000F-QINU`"'? Engines". Is it really necessary to use math markup? How about D^D_E instead? After all, an earlier heading reads "D^DE tank engine". and this displays just fine in both TOC and heading. -- Redrose64 🌹 ( talk) 16:56, 22 July 2023 (UTC) reply

Fixed. -- ThylacineHunter ( talk) 02:24, 24 July 2023 (UTC) reply