In the pattern you posted, the offset for the blocks on the left is different from the ones on the right. The easiest way to notice this is turning on the gridlines and comparing the block locations.
I was aware, I think I mentioned it.
The track doesn't regenerate exactly as it started, even excluding extraneous junk, so a collision would be required to move the junk and make it useful, along with the starting b-heptomino. I imagine this would be much harder than a simple glider destruction.
What do you mean? As long as you re-position that left block it's ready to use again.
One-directional method that allows for parallel-tower construction:
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x = 115, y = 129, rule = LifeHistory
EDIT: there surely must be a way to interact with the LoM for 1G or 2G and get that block precisely there. With a 1G way to do it, a separate column for the crawler, flipped over the y axis (i.e. press X in Golly), would regenerate, upon use, a parallel column.
I mean, when the B goes through that it releases gliders. If there is a 1G way to do this, since the interval is the same because the reaction is the same, you just arrange it accordingly and the track will be regenerated.