I'm looking for a way to achive a fast 30ft track - 40ft including start up and slow down. Any thoughts? It's only one shot.
Last time I did this I paid a fortune for track, dolly, delivery and return. There must be a cheaper option. The problem with the above solution is the PVC piping which doesn't come in such long lengths.
Cheers!

This has changed over the years.
There have been exceptions, like Spielberg directing Jaws at 24, but 40 years ago you'd expect to be pushing 50 before being given a break. That age has since dropped hugely. So then and now is like comparing apples and pears.
The same has also happened with DPs. A few decades ago it was unthinkable to see one in their 20s, but now...
I leave it to others to figure out why this has happened.

Just as well I bought spares. But this is a bit of a shock. I thought these would go on for a lot longer.
It's not just DSLRs I use these for. I put a 20mm on my FS5 with a speedboster and get 14mm @ f2. It's for a very specific use.
This trend will only accelerate.

All the Star Wars films would benefit from this about ten minutes in...

This idea has been gospel for years. It makes sense, doesn't it?

However some years back someone set up an experiment to see if it actually worked. And it didn't.

Here's an interesting read https://www.jstor.org/stable/1225144

I find the only people who complain about this are documentary filmmakers and amateurs."
And anybody doing timelapse.