I would suggest that if this question was placed on the 3 rail scale forum or the 2 rail forum there would be a very different response. While there is no problem with anyone enjoying the hobby any way they like, there are several who post here including myself where scale fidelity is important. 100% accuracy is going to be impossible just by the nature of scaling something down to 1/48th of its original size, however very close accuracy is entirely possible.
I just received my 3rd Rail FP7s today in 2 rail and they are the finest plastic shelled diesel I have seen in the industry in any scale. The best one prior to that were my 3rd Rail FL9s. The liveries are correct and the road specific details have been captured to level that is reasonable while keeping the cost competitive.
If you want prototype fidelity, understanding that everyone does not, research your history and you will find models from all the major manufacturers that meet that desire. It was scale length cars and scale locomotives that got me out of HO and into O and I have enjoyed every bit of it.