Deerhunter is right, the RR spikes are made of a soft iron, and if properly hammered in tight hold very well.
I'd say from the picture, he picked a good spot for that sized spike.
What you guys that have that broken "country rock" stream bed can do is, make some smaller "knifeblade pitons" from flat stock.
Take a piece of 1"x3/8", drill a hole in one end, and sharpen the other end like the RR spike is (but don't make it so sharp it's dangerous, and don't overheat it).
These can "snake" there way into a crack, and the soft metal will take a good hold.
Narrower cracks tend to have more parallel, stronger walls, and will provide the most effective "placements" (climber word).
You can drill a series of holes, to lighten the pitons, and so you can tie off close to the rock or anywhere along the blade.
You end up with a smaller lighter "rock stake" that does a good job (but you can't find them along the RR track for free).
Spikes and pitons could be removed if the creek is used for wading, fishing, rafting, etc.
With the use of a "funkness device" (another climber term).
A funkness can be made with a trapper's hammer, a loop of stout poly rope, heavy cable (or better, chain), and (in the case of the pitons with an eye) a quick link.
It should be a little shorter than your arm, so you can't hit yourself with what you pull out.
My trappin' hammer in a metal handled 2# Estwing... so I'd slide a big quick link over the handle of my hammer, and the quick link in the other end gets hooked onto the stake or piton.
On RR ties I would hitch the loop of rope to my hammer, and to the spike, with a doubled larks foot knot (also known as a double girth/girdle hitch, or a Prusik knot).
Swinging (sideways) away from myself, and keeping my eyes away, I make a few soft swings of the hammer against the chain.
A funkness device hits with tremendous force.
Stop and check to see if the stake moved, and continue, swinging a little harder when you need to.
Usually with less force and fewer blows, you can funk out whatever you hammered in.
As it starts to move it will get easier, so slow down.
It will come out with tremendous force, if you are still applying it.

Pitons could be used on land, anywhere there's a crack in a rock that you have one that fits, and in frozen mud and ice.
Krusty
