I have to piss like a Russian racehorse, and I mean like right now!

an animal generically distinct from another

Pacers should have all been withdrawn by now, but that has been scuppered by a failure to deliver new trains on time and delays to infrastructure projects. The most high-profile withdrawals were to be Northern's Class 142s and '144s' (the latter by the end of 2018, and the '142s' by the end of last year).

He that keepeth Israel shall neither slumber nor sleep.