So, I rarely replay scenarios, They are usually a one time and done deal for me to unlock a mastery or trophy. But if I do it's often on North Transpennine or Tees Valley. They usually are more interesting and more variety and have more than a "Go to B from A" vibe. What route has your favourite Scenarios? Or what has your least favourite? For me my least favourite is West Somerset Railway, they are tedious.
There are a couple on Clinchfield that have caught my attention. You can always tell when someone goes a little further and uses his/her imagination and player face.
I like the scenarios on the East Coastway and Southeastern Highspeed Extended where the door opens and you have to close it yourself and end the service early. The East Coastway also has a really fun 'Cutting Closure' scenario that has you drive a Class 66 to a landslip to help with clearing it. I also like Northern Transpennine's 'Red Bank Rotation' where you use a Class 47 to shunt some carriages around. I remember playing Cologne-Aachen's 'ICE and snow' scenario multiple times. Great scenario. I liked the amount of traffic and adverse aspects on London Commuter's scenario where you take a slow service on the fast lines from Purley to London Victoria stopping at every station on the way. I played that a fair amount too. I liked Vorarlberg's scenario where you have to do emergency moves to get people away from the floods. While the floods themselves didn't seem to exist, I did some roleplaying and tried to get the train to the station as quickly as legally possible, braking really late when nobody was on board. Then basically all the TSW4 scenarios that had music were brilliant! Especially 'Testing the Limits' on the East Coast Mainline.
There's a scenario on NTP that I've often replayed. It's name escapes me. Its the one with the Class 08 where you pick up wagons at Leeds Station and shunt them to Holbeck.
Tools of the trade I believe! Standedge struggle is another good one if you have the heavy freight pack.