Tolerance(s)...

Dem feckin' Dubs... Movin' up here, takin' our homes and actin' like they own the place in their forrin' colours!

It's not easy being a "blow-in" sometimes...

Explaination
They have a wheel lathe in Drogheda for skimming the Commuter train wheels, but it doesn't run at full capacity. So they've started sending DART sets up from Fairview whenever they need routine maintenance on the wheel sets.

Had me wondering the first morning I saw one!