Caravanistan

So what was the rate?

You are entering the same place cars do, and not where trains do, I assume.

Did you read the visa page?

I think those people are very optimistic if they think a $10 bribe will get you into the country without a visa.

I arrived at about that time. There should be taxis, since you won't be the only person getting off. I walked, however, since there isn't much else to do at that time. There were some cafes open on the boulevard near the station. When I was there the Gur-e-Amir complex was illuminated all night long...

Someone here did it recently. Not much details in his blog, but you could ask him.

viewtopic.php?f=7&t=5901&p=19869#p19869

It's probably feasible if you know beforehand exactly what you're doing, how you're going to do things, where to get started, etc. But if you're arriving in each place and have to figure out logistics (where the trailhead is, how to get there, whether there will be a place to stay) on the fly, then ...

People do it all the time without any problems, and I haven't heard of police checks and visa inspections being common.

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You should be fine so long as you have the LoI in hand, as the IATA rules indicate that that's all you need (i.e., you won't be denied boarding for not having a visa). https://www.emirates.com/ca/english/before-you-fly/visa-passport-information/find-visa-requirements-results.aspx?NC=CA&NV=Canada...