The same thing with the speed changes happened in the Legacy Versions. Speeds got doubled in one update, and reverted sometime after, and increased again sometime after that.
Check the history here at the bottom of the page for all versions.
So, it seems to be what I'm saying then? This "faster Minecart speed in the past" was never something that existed in Java, but is people remembering an old console version that has differences from Java? I'm looking at all of those update notes prior to 1.2.5 (when I started playing) when I started playing and I don't see a single update note about speeds being reduced?
Something like an attempted snapshot change that doesn't go through isn't too relevant in the scope of people remembering "it used to be faster" because that never existed in true capacity; it wasn't around in a live version and/or for a meaningful length of time and/or in proper working condition (sounds like they were derailing). So anyone saying "they used to be faster" most certainly wouldn't be referring to that specifically, especially if they are saying they used to be "a good two times faster" (how much faster were the attempted 1.8 snapshot speeds?) and "Xbox 360 days".
So, it seems to be what I'm saying then? This "faster Minecart speed in the past" was never something that existed in Java, but is people remembering an old console version that has differences from Java? I'm looking at all of those update notes prior to 1.2.5 (when I started playing) when I started playing and I don't see a single update note about speeds being reduced?
Something like an attempted snapshot change that doesn't go through isn't too relevant in the scope of people remembering "it used to be faster" because that never existed in true capacity; it wasn't around in a live version and/or for a meaningful length of time and/or in proper working condition (sounds like they were derailing). So anyone saying "they used to be faster" most certainly wouldn't be referring to that specifically, especially if they are saying they used to be "a good two times faster" (how much faster were the attempted 1.8 snapshot speeds?) and "Xbox 360 days".
My first post on this thread, pulled quotes directly from the update history of Java with regards to minecarts. A snapshot was introduced increasing the minecart speeds, on Java, for maybe a week [Given what I think I know about snapshots, these changes were almost more than a month apart] (this likely falls into the "Not meaningful amount of time" condition you mention). It wasn't an attempted snapshot. It was a legit implemented snapshot that changed several other things. The specific minecart speed change in said snapshot, got reverted because enough people complained about it ruining certain builds. It was a long enough time frame that people could use it in an official capacity, and decide it wasn't worth keeping around.
I then pulled up from that same history, the Legacy Changes from the early days of Console Minecraft. How long the changes were in Legacy, I'm not sure of. Changes happened in different TUs.
I'm aware that these were changed in snapshots, but they were just that; snapshots. It wasn't the behavior in 1.7.10, nor behavior in 1.8 once it was official, so it never made it out of the "any changes aren't final" phase that snapshots represent. So my statement of it being an attempted change is valid.
This is all ignoring the surrounding context anyway (why?). The question I was asking, and here it is exactly for clarity...
"Wait, did minecarts used to be faster? I thought they were always like this. I started playing in 1.2.5 and I don't remember them being a lot faster? I even made a rail network using them to link a lot of my locations."
...was basically asking if at any length of time in the past (either before I started playing, or for a period of time while I was playing that I may have missed), were minecarts originally (much) faster, and then made (much) slower.
For further context, I was asking that in response to this claim...
"Back in the day minecarts were like bullet trains..."
So an attempted change that never lived past snapshots is likely not relevant. Especially when later posts by the person I was asking that to clearly indicated they were most likely referring to the console version.
Sometimes the most likely explanation is the correct one. Someone was just confusing something exclusive to the old console version with something that was never the case in the Java.
(how much faster were the attempted 1.8 snapshot speeds?)
20 m/s or 2.5 times faster than the previous/current speed, according to a revision from the time, which also mentions the issues they had in more detail:
As of 14w11a, the physics of mine carts have drastically changed, meaning that many of the above statistics do not apply in 1.8. Minecarts now go faster and farther - they have a new defined speed limit of 1 meter/tick or 20 m/s (or 72 kph). They have improved collision and position handling, meaning minecarts can no longer be merged.
One of the most significant changes is that minecarts can derail at corners if going too fast. One way to combat this is to place two unpowered powered rails, followed by an activator rail before each corner. If the minecart is going at full speed, this reduces it to a speed where the mine cart will be able to go round a corner. In addition, placing fences/glass panes around each corner will also prevent the minecart from derailing.
Minecarts can also refuse to go uphill. If a minecart is going too fast, the minecart will refuse to go uphill. This means that players have to test for the optimal speed at which a minecart is able to go uphill, and provides an extra challenge.
Minecarts can "fly" off rails if it is accelerating downhill. When the minecart reaches terminal velocity (or its fastest possible speed), the minecart will "jump" off the rail.
All the issues mentioned seem to stem directly from the fact they can skip over an entire block in one tick; entity collision does account for this, else when falling you'd end up in the ground instead of on it unless the fall distance in the last tick was exactly enough, or walk inside a wall, and so on, but I didn't see any extrapolation being done when checking for surrounding blocks like rails (adding such would be able to solve these problems but Mojang decided not to, I do wonder what the actual speed limit is before issues arise).
Oh, that is actually surprisingly fast compared to what I would have thought, but regardless, a change in testing stages that never made it through was never what I was originally asking about. It seems like minecarts were around twice as fast in the older console versions compared to Java, and that's where the confusion stems from.
In my first world in 1.5, I was deathly afraid of mobs in caves due to the old combat style (skeletons had no bow animation, creepers exploded from further, and mobs could melee from larger distances). So I barely got far down enough for gold, redstone, or diamond, and didn't have enough to make powered rails (I tried strip mines but swiss-cave design made this untenable after a point and I had to make many such mines).
So I had a minerail where there would be constant bumps up and down a block in order to create speed through the gravity while pressing W. It was faster than a straightaway and reduced the risk of suffocation damage from the ceiling, but it still felt cramped and inefficient. I only ever finished one such line, going from my base and main cave site to a dungeon and secondary cave site.
I was building another, much bigger one, under a mountain range and across underground ravines to a village and new home I had, but since scaffolding didn't exist, I kept getting knocked into ravines by arrows and climbing spiders. So I gave up on it. It didn't help that i lacked exact coordinates at first until I learned that the debug screen existed, so the two sides of that secondary rail line weren't lined up properly.
Any mob can be put in a minecart, except for bats, ender dragons, iron golems and withers (and wardens if a repeat sentence is correct), there is otherwise no "size" restriction, unlike boats; even Giants can fit in minecarts (if "fit" is the proper word):
My goodness, as of the latest snapshot, it seems like the thread starter is getting their wish! I literally though of the "make minecarts faster please!" person when I saw this. I hope the thread starter comes back, haha.
"Added a new accessibility setting that makes players follow the rotation of Minecarts they ride"
Ever since 1.2.5 updated to 1.3, this change always made things feel "off" to me. Which is odd because I only experienced things the original way for a single version, but it's one of those original things coming back that will make the game feel better for me.
(Apparently there's also some optimization/performance/quality of life improvements in the update but I haven't tried it or read further into those.)
So, it seems to be what I'm saying then? This "faster Minecart speed in the past" was never something that existed in Java, but is people remembering an old console version that has differences from Java? I'm looking at all of those update notes prior to 1.2.5 (when I started playing) when I started playing and I don't see a single update note about speeds being reduced?
Something like an attempted snapshot change that doesn't go through isn't too relevant in the scope of people remembering "it used to be faster" because that never existed in true capacity; it wasn't around in a live version and/or for a meaningful length of time and/or in proper working condition (sounds like they were derailing). So anyone saying "they used to be faster" most certainly wouldn't be referring to that specifically, especially if they are saying they used to be "a good two times faster" (how much faster were the attempted 1.8 snapshot speeds?) and "Xbox 360 days".
My first post on this thread, pulled quotes directly from the update history of Java with regards to minecarts. A snapshot was introduced increasing the minecart speeds, on Java, for maybe a week [Given what I think I know about snapshots, these changes were almost more than a month apart] (this likely falls into the "Not meaningful amount of time" condition you mention). It wasn't an attempted snapshot. It was a legit implemented snapshot that changed several other things. The specific minecart speed change in said snapshot, got reverted because enough people complained about it ruining certain builds. It was a long enough time frame that people could use it in an official capacity, and decide it wasn't worth keeping around.
I then pulled up from that same history, the Legacy Changes from the early days of Console Minecraft. How long the changes were in Legacy, I'm not sure of. Changes happened in different TUs.
Fool me once, shame on you. Fool me twice, shame on you. Fool me three times, hold up, rewind, That's not even possible.
Using the ignore feature here is kinda weird.
I'm aware that these were changed in snapshots, but they were just that; snapshots. It wasn't the behavior in 1.7.10, nor behavior in 1.8 once it was official, so it never made it out of the "any changes aren't final" phase that snapshots represent. So my statement of it being an attempted change is valid.
This is all ignoring the surrounding context anyway (why?). The question I was asking, and here it is exactly for clarity...
"Wait, did minecarts used to be faster? I thought they were always like this. I started playing in 1.2.5 and I don't remember them being a lot faster? I even made a rail network using them to link a lot of my locations."
...was basically asking if at any length of time in the past (either before I started playing, or for a period of time while I was playing that I may have missed), were minecarts originally (much) faster, and then made (much) slower.
For further context, I was asking that in response to this claim...
"Back in the day minecarts were like bullet trains..."
So an attempted change that never lived past snapshots is likely not relevant. Especially when later posts by the person I was asking that to clearly indicated they were most likely referring to the console version.
Sometimes the most likely explanation is the correct one. Someone was just confusing something exclusive to the old console version with something that was never the case in the Java.
20 m/s or 2.5 times faster than the previous/current speed, according to a revision from the time, which also mentions the issues they had in more detail:
All the issues mentioned seem to stem directly from the fact they can skip over an entire block in one tick; entity collision does account for this, else when falling you'd end up in the ground instead of on it unless the fall distance in the last tick was exactly enough, or walk inside a wall, and so on, but I didn't see any extrapolation being done when checking for surrounding blocks like rails (adding such would be able to solve these problems but Mojang decided not to, I do wonder what the actual speed limit is before issues arise).
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?
Oh, that is actually surprisingly fast compared to what I would have thought, but regardless, a change in testing stages that never made it through was never what I was originally asking about. It seems like minecarts were around twice as fast in the older console versions compared to Java, and that's where the confusion stems from.
says the minecart
Minecarts are fast enough.
In my first world in 1.5, I was deathly afraid of mobs in caves due to the old combat style (skeletons had no bow animation, creepers exploded from further, and mobs could melee from larger distances). So I barely got far down enough for gold, redstone, or diamond, and didn't have enough to make powered rails (I tried strip mines but swiss-cave design made this untenable after a point and I had to make many such mines).
So I had a minerail where there would be constant bumps up and down a block in order to create speed through the gravity while pressing W. It was faster than a straightaway and reduced the risk of suffocation damage from the ceiling, but it still felt cramped and inefficient. I only ever finished one such line, going from my base and main cave site to a dungeon and secondary cave site.
I was building another, much bigger one, under a mountain range and across underground ravines to a village and new home I had, but since scaffolding didn't exist, I kept getting knocked into ravines by arrows and climbing spiders. So I gave up on it. It didn't help that i lacked exact coordinates at first until I learned that the debug screen existed, so the two sides of that secondary rail line weren't lined up properly.
Rding a pig that's stuck ina minecart makes it go faster apparently.
I Agree
Lol, what about a horse then
Ummmm do horses even fit in minecarts?
Yes, I believe they do.
Any mob can be put in a minecart, except for bats, ender dragons, iron golems and withers (and wardens if a repeat sentence is correct), there is otherwise no "size" restriction, unlike boats; even Giants can fit in minecarts (if "fit" is the proper word):
https://minecraft.wiki/w/Giant#/media/File:MinecartGiant.png
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?
My goodness, as of the latest snapshot, it seems like the thread starter is getting their wish! I literally though of the "make minecarts faster please!" person when I saw this. I hope the thread starter comes back, haha.

https://www.minecraft.net/en-us/article/minecraft-snapshot-24w33a
I'm excited about this!
"Added a new accessibility setting that makes players follow the rotation of Minecarts they ride"
Ever since 1.2.5 updated to 1.3, this change always made things feel "off" to me. Which is odd because I only experienced things the original way for a single version, but it's one of those original things coming back that will make the game feel better for me.
(Apparently there's also some optimization/performance/quality of life improvements in the update but I haven't tried it or read further into those.)