Amtrak #174 is what we used heavily during beta testing because of the signal drops. If you want to test your signal knowledge, that's a good choice.
Notice #801 Boston to providence was a good service for not running on time as leave late at Boston waiting for amtrack train to arrive from depot making me late over 5 mins
If you don't mind creating a bit of your own Chaos, you can try the Cab Car 7:48 am run out of Stoughton and deliberately leave 4 minutes late. You get to tab through, or in some cases, not tab through reds along the way. Details on how that works can be found in the post here: https://forums.dovetailgames.com/threads/awesome-tsw2-service-mode-runs.32010/page-11