Way back, when the railway systems were owned by the state, the company known today as Metrorail used to fall under the banner of the South African Railway Services, aka SARS. Then one day the South African Revenue Services (our income tax government department) decided that they wanted the name "SARS" and instructed the government privatise and change the name of the South African Railway Services. They were a bully, and so now the South African Revenue Services is know as SARS.
I'm lying about the reason for the privatisation, and the involvement of our tax department, of course. The little lie explains however how strange it is to some of us to see all the old trains and old equipment labelled "SARS", and I figured this may clear it up for those who weren't around at that time - no, SARS isn't in the business of owning trains. :)
Back then, since the rail services were owned by the government, it made sense to use the springbok (our national animal) as an emblem - hence the springbok on this old train window.