That is NOTHING. You want scary? Go to ANY shortline, walk a few hundred feet......... I still get the hebbie-jeebies just thinking about how few spikes, fish plates, and good ties we had on the KLS&C Railway, and we ran several trains (tourist and dinner) per day.
However, since we were regulated by the ICC, (today the STB) and ran passenger trains, we were inspected about once a week, maybe it was monthly, I don't remember. But we got to know the track inspector REAL WELL. Him and that damn Day-Glo orange can of spray paint he used to mark defects... Ugh.
A lot of times people get wigged out when they see a train at a road crossing, and they watch the rails "give" or go up and down. They are SUPPOSED to.
Now, "pumping mud" can get a bit dicey, 'cause left unchecked, it just usually always gets worse. But if it only happens once in a while, no problemo.
I also see clamps on the rail, so this is better than most.........
A lot of it has to do with speed, weight, and makeup of train.
It's amazing that more trains don't derail, but then a LOT do, at slow speeds, that never make the news, and shouldn't....
I was even able to re-rail a freight car I ran off end of track, by simply positioning some lumber to guide the two rear wheels on the last truck, and "pulling" the train back on the track.
You can safely get on that commuter train ALL DAY LONG. (But then again, I am not a track inspector, I just used to distract them, or offer them a ride in our hyrail......... so we could go FASTER down the track, instead of walking so damn slow...........)