#ksp

The bug was later fixed by defining the active spacecraft itself as the origin of the game's coordinate system. In effect, the spacecraft no longer moves; instead, the spacecraft remains stationary and the entire universe moves around it. Owing to how relativity works, to the player this is indistinguishable from the spacecraft moving about within a fixed coordinate system, and it ensures that the body of the craft and its components will always be modelled with maximal precision.

While elegant, this solution introduced a new problem: it was now possible, by doing certain stupid tricks with relativistic velocities, to introduce floating point rounding errors to everything except the active spacecraft. In extreme cases, this could result in the destruction of the entire observable universe.

Obviously this practice was abandoned for safety reasons. But Kerbals don't have such concerns.

So Kerbals, of course, operated slip coaches on some of their passenger rail lines.

But one of the stated benefits of the space program is that it provides spin-off technologies to improve Kerbal lives and industry here on Kerbin, not just in space.

Consequently, Kerbals began employing "reverse slip coaches," where a coach would rest in a siding off to the side with a protective wall between the siding and the passenger station. When the train passed, it would, with precise timing, fire rocket motors provided by Periapsis Systems of 'sepratron' fame, to accelerate the coach up to speed, so that it could couple onto the passing train. It was a tremendous success! *