In 2012 Google Maps was get huge promotion: they hired a special train at some of Swizerland mountain railway, and make a streetview from flatcar.
In 2016 i am repeat this technology stack with panoramic camera Ricoh Theta S at Apsheronsk narrow-gauge mountain railway.
It was a fantrip, provided by rusbestrailways.ru. Lucky, railway give for train a flatcar, so i sat in center of car, and use a camera with selfie stick. I make a shots only in intresting sections.
Camera was set in auto-mode using Android app. I record GPS-track at separate Garmin device, and georefrenced pictures while post-processing in JOSM. Image rotation was corrected with https://github.com/trolleway/theta_tools
I upload 700 photos to #Mapillary, and they accesible there: http://www.mapillary.com/map/search/44.151574115138715/39.75610589669472/10
Frist problem – a electricity. I use an external battery, but Ricoh Theta S cannot be attached to selfie stick and power supply at same time.
Second problem – a bulk upload to Google Street view is hard, dye to memory leaks in Android app.
Third problem – a big compass value error in Ricoh Theta S. Arrows in Mapillary working wrong.