Thanks for obliging the view and comments!
Yeah, on tripod (I will show you a shot of my handy little phone holder sometime that I mount to an arca plate. Got it a long time ago for cheap, came with a mini gorrilapod type tripod, and discovered after years that it is adaptable...) And all frames IR. Definitely too fidgety to try removing the filter. I did drop it and it almost rolled down and entire flight of stairs but I blocked it just in time.

Very impressive improvisation given SD "loss". Was your phone mounted to your tripod or just braced on a wall/fence/railing? A pity you weren't in a position to get a shot of the rig as well The image has come up really well as a composite hasn't it? And has your signature with the "ghost train" and the reflections off it - were all frames IR?