Historical accuracy has to compromise with the tooling/production/distribution costs of a product that is serving what is actually a tiny customer base (model railroaders).
On the other hand, if we accept too much wiggling, it only encourages them.
Lionel and Williams did indeed produce E-7's; Lionel even produced the E-6 in scale, as did MTH in RK. Not sure about a scale MTH E-7. I think that 3rd Rail did some.
Decals (see eBay to start) may be your answer.
