Two cases:

1. Rails placed from East to West then. After 3 booster tracks train (which contain 2 or more empty carts) stops 2 blocks away (distance from end of last boost track and end of last cart). Like a super deceleration.
2. Rails placed from South to North. After 3 booster tracks train (which contain 2 or more empty carts) do not stops as fast as in previous case. It's normally.

First case you can see at this screenshot:

Thanks!

Ouch, sorry. Already fixed (?).

Working as intended, hook up a locomotive.