Steve the improvements look great. Although most transformers are usually one color, grey, the MTH color seems off. The appurtenances that you chose to paint silver are totally believable in a color other than the overall color of the transformer. Your rendition makes me think boiler more than transformer. Your weathering is spot on.
Chris is that whole MTA flat a roll-your-own or did you just detail a commercially available car. More details on the containers and garbage bags would be appreciated.
Here's a homemade LEGO transformer load in a deep well flatcar.