For myself, being not so new, but not so knowledgeable to model railroading and railfanning in general can be quite a learning experience. Though, I've always known what location and era I want to model and have made sure to buy my structures, rolling stock, etc. accordingly.. I've also realized that I know virtually nothing about diesel locomotive makes, models, years of production, etc. When I bought my 2 Lifelike Southern Railway N scale diesel units some 20 years ago (with Rapido couplers), all I cared about was that I had two beautiful Southern engines, which I'd come to know as "Southern Tuxedos", with two different road numbers, 202 and 207. Lifelike sold them as (EMD) SD-7 units, identified on the jewel case insert. As I began watching YouTube videos on N scale SD-7s, I came across a guy doing an unboxing of one of the exact same engines I own that he bought (new/old) off eBay. It was a short video, but I found out something I've never known. He pointed out the markings "C of G" underneath the road number, which he remarked "Central of Georgia". I grabbed a magnifying glass and looked at my engine... it has the same gold marking. I'd never noticed it, it's so tiny. After some research I started learning about all these great old defunct railway companies: Central of Georgia, RF&P, SCL, SAL.. that had been inherited into Class 1 railroads after acquisitions. Southern Railway absorbed Central of Georgia rolling stock, but I couldn't find any record of SD-7s with road numbers 202 and 207 ever purchased by C of G. Finally, I stumbled across the information I was looking for. I first found prototype photos from 1985 of both my locomotives, ironically, coupled together. Then, I found that these locos weren't EMD SD-7s, but in fact, EMD SD-9s. The only differences in the two models were engine design, the exterior was basically the same. On Wikipedia's page on the General Motors EMD SD-9, it states that 515 units were produced from 1954-1959 and six of those, 202 thru 207, were purchased by Central of Georgia. As far as Lifelike's production of these models being labeled as SD-7s, I'm not sure what happened, there, but obviously they were basing these on actual prototypes. They are great running little engines, very smooth and quiet. I don't know about Lifelike quality these days, I've heard bad things, but apparently these were produced in a time when quality was high. They haven't been run in 20 years and with only 20 minutes (break-in) total run time, so they will need a complete breakdown and cleaning/lubrication.