Here's a re-rendering with better behaved sheet metal seams. Not only is the seam now a bump map but it's been reduced from 100% "intensity" to 23%. Being produced at the Instagram worthy ratio of 720 X 480 also makes the noisiness in the reflections more tolerable.
piggyback_walkthru_insta_h264.mp4
Keep in mind that this is a WIP and I have a long way to go (including getting the lighting right but I'm still pleased with the result.
Here's two views of my arcade taken from the street entrance end and showing the concourse archway in the distance.
Before I move on to the next railcar I beg your indulgence while I brag about getting a believable "look" to the rear running lights. The rear facing lenses are tinted red with the other three are tinted green. The light from the internal bulb is quasi collimated i.e. the lamps appear illuminated only if viewed close to on-axis with the lenses. I wheeled the caboose back into the dark factory to get a better view.