To be fair, this was probably one of a *very* small number of cabins officially called 'boxes'.
A few cabins carried bi-lingual enamel signs, that at Mallow (South) appears to have been in place up until recently until replaced by what looks like a replica. Claremorris and Birr might have had bilingual enamels on the cabins there, but can't confirm.
Others carried painted on tin versions of the enamel bilinguals (Bantry, Killeagh, Midleton, Youghal & Cherryville Juct, and possibly Mogeely/Limerick Check/Limerick Station come to mind)
The MGWR cabin at Ferns Lock seems to carry an off-standard MGWR enamel nameboard in the O'Dea collection photos.
Re the GSR era bilingual signs, at a few locations these were painted over in white and the letters picked out in black (the opposite way round to the enamelled colours) to match the newer signage. Mallow is one place that that happened.