Here's a small handful of "standing on the track" POV shots I've taken over the past decade.
0:00 Amtrak Dash 8-32BWH #503 Ventura, CA (June 2016)
1:24 TRESPASSER! + Amtrak F59PHI #463 Carlsbad Village, CA (February 2014)
2:14 BNSF Dash 9 #4024 (Cajon Pass, CA (Spring 2016)
3:08 Canadian National #89 2-6-0 "Mogul" steam locomotive. Near Ronks, PA (September 2023)
4:03 Altamont Corridor Express (ACE) Cabcar #3302 Pleasanton, CA (May 2023)
4:58 Coaster Cabcar #2306 Downtown San Diego, CA (January 2024)
5:39 UP BIG BOY #4014 Cajon Pass (October 2019)
6:34 Amtrak F59PHI #455 Cardiff, CA (January 2014)
7:00 Amtrak F59PHI #458 South Orange County, CA (Spring 2015)
7:20 Amtrak P42DC #169 Carlsbad Village, CA (Summer 2017)
7:49 Amtrak ALC-42 #314 Los Angeles, CA (Spring 2024)
8:51 Amtrak Pacific Surfliner cabcar #6900 Carlsbad Village, CA (January 2014)
9:21 Amtrak F59PHI #452 San Juan Capistrano, CA (Summer 2015)