From: BURT on
What about a twin on a fast flowing train?
If the stations clock is outside he could observe it to see what is
happening. Now during the interval of the train passing there will be
the opportunity to compare.

The train is supposed to see the stations clock going slow in the SR
theory. But if that is true how does the train find time to go slow in
its aging?

This is an example of getting rid of the lost time solution.

Mitch Raemsch