I grew up with it too... but I model the 'sector' era. Why? Because it's more colourful. However I have multiple locomotives (in multiple liveries)... I have about 8 x 33's with more on order, 4 x 47's, 4 x 50' s etc... if I modeled the period half a dozen years before I would only want half that number, which I suspect is one of the reasons why 'rail blue' is such a popular subject...
...mind the trains were a lot longer back then so you might need a bigger layout with more rolling stock