The bug

As described in previously known and reported issues like MC-156470 or MC-151571. Minecarts have been missing one of its main factors that made it as enjoyable as any kind of Transportation in the game; its ability to go really fast on land, or even uphill.

However, this functionality was changed upon the release of 1.14, making them slower than ever to start, and impossible to go up by even a block using the Normal Rails, the fix is when using Powered Rails to go up instead... but this isn't the point. Minecarts (like how the boat acceleration changed in 1.9) differ to how they used to be in prior versions to 1.14 (e.g. 1.13.x) and are now ridiculously slow (see video).

Although the reports I provided were prior to this one (whilst unable to obtain a response from these as they are now closed), I do hope this one provides enough information to come to a resolution soon.

EDIT: I am wondering if this is related to the Player's weight, and means this is intended?

Reproduction steps

• Place a Minecart on some normal rails; travelling up a block
• Try going up that block whilst in the Minecart