I only have experience with my first GoPro a Hero 3, which worked fine, except I could not get rid of the fisheye effect on close shots, and I like close shots. For long shots it is fine, and the older Gopros can be had quite inexpensive, reconditioned or on Ebay. I bought the Gopro 8 a year ago, and have done 33 videos since. Its size allows it to ride the train, it has great sharpness and depth of field, works in bright light and night scenes. Also great sound. If anything, sometimes it is too good, because it picks up details of tools and things left on the layout, sometimes it is hard to keep myself out of the picture. The model 9 is out, so I am sure that 8's are now discounted. Also many different mounts are available. Besides my different camera cars, I can mount it to one of 2 tripods, I also use a microphone stand, from my garage band days, with and without a 12" bracket that allows shooting down on the tracks from overhead.
I use HD Moviemaker Pro for composing and editing. It is inexpensive, from the Microsoft store. It has great features for editing, trimming, special effects, slo-mo, adding text etc. My audio is both live from the GoPro and added separately. I can dial-down the noisy E-units. Before I found the Youtube audio library I experimented with composing virtual music on the Garage Band app on my I pad, also brushed-up on my guitar and composed some generic cord-progression type music. I have a Vox amp with many fuzz, distortion, sustain etc type of effects that smooth out mistakes that my tired old fingers make.
My big question is when did you buy a 763E for under $300......1970?
Anyway, bottom line is that I think the combo of the GoPro 8 and HD MovieMaker Pro produces very satisfactory results. I tried some other programs before HDMM, but they were harder to work with.
Anyone else have some ideas for Terry?