184 and the Cattle Train race.

[Hawkerhellfire]

Unusual question, I believe in both the IRRS Journal and the RPSI Journal Five foot three there was a retelling of a story regarding the preserved J-15 184 and her use in the running of an unofficial race between the GSWR and DSER for the contract to run cattle trains to Dublin. I think the DSER engine was 14. Would anyone know what copy of these journals the story appears in as I would quite like to reread it.  Thanks very much. 

[Mol_PMB]

It appears in the book ‘Steaming in Three Centuries’ but may also be elsewhere. 
@leslie10646 may be your best lead.