Suboptimal routing with trams 2/3

Trams 2 and 3 are special in a way that the tram numbers get swapped on two stops: "Olympialaituri" and "Eläintarha". This leads to suboptimal routing when the tram 2 or 3 would be crossing these stops. In particular: the routing assumes that passengers need to hop off the tram and wait for the next one (if you're in tram 3, you are asked to hop off, wait for 7-8 mins and then hop on to tram 2, and vice versa). In reality the tram number is changed on the fly and the tram continues from the stop without delay.

Since the routing thinks there's an extra 7-8 minutes in this route, alternate routes get priority over this faster one.

Here's a demonstration of the subobtimal routing (enforced by disliking walking):
https://sintonen.fi/pics/hsl-tram-2-3-routing-fail.png

PS. This issue exists in the old route planner, too. It's about time to get this fixed...

The issue names no files, tests, or entry points, so first trace where routing decisions for tram routes 2 and 3 are obtained or assembled in this repository. Reproduce the shown route and identify the relevant routing data or integration; done means the planner treats the tram-number change at Olympialaituri and Eläintarha as continuous travel without the extra wait.