How to efficiently replace 25-tiles long trains?

I have very long routes from one edge of the map to the other, serviced by 25-tiles long trains. Whats the most efficient way of replacing them once they get obsolete by new engines?

- Crash them?
- Have very long outlet tracks to send them to depot?
- Temporarily destroy the route and place depots right after a station?

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u/MyTinyHappyPlace — 3 days ago