UPDATE: This from Bill Hoole...
Why do drivers need a large plaque in the cab telling them the sort of train they are driving?
So long as you can find the Regulator and the brake when you get in the cab, that's all you need to know.
UPDATE: This from Sir Humphrey Beeching...
As some of my departmental colleagues might quip - it's the regulator that's the problem.
If Pollyanna would only get out of the cab the railway would run so much better...