You also have to know how to pull a torque wrench. If you pull a quality wrench the same way every time, you'll get consistent results, but if your technique is flawed, you won't get the torque the wrench is set to.
I wouldn't recommend a $20 Harbor Freight torque wrench. I've seen their style wrenches click off with ZERO fastener rotation. It's called Side Load Error. Besides that, if a $20 wrench repeats the same as a $150 or $200 wrench. Why wouldn't assembly plants switch to Harbor Freight tools?
Just because the wrench clicks off is no guarantee that fastener is torqued to spec. And that's true even when using High End wrenches.
The main wrench I use and acquired through my past career cost around $7K. No need for that on rail bolts. Just demonstrating there's a very wide spread between China quality/reliability and true quality torque measuring devices.
I'd recommend spending at least $100 on a wrench and watching YouTube vids from well known torque wrench manufacturers on how to properly pull a wrench. Be sure that the click came when the bolt was moving.
If that didn't happen? In other words, you came back for another stroke and the wrench clicked off before any bolt movement?? Slightly back off that bolt, then move it forward till you get a click.
Torque is measured while the fastener is moving.
Gotta stop or I'll be writing a book on a forum.