People in the asso I play are still asking all the time what is the best train after the pioneers update and changes to trains.
Some are still using the "old" best trains
Changing stats every round sounds like to much hassle for most players. what I would like is to have more destinctive differences.. so that is worth buying multiple type of trains instead of just picking the best average train for the era.
What I would like also as a new feature on trains is that there is a fifth slot to research that is flexible.
On that slot you can pick any of the 4 available upgrades but only 1 can be in effect to add 1 wagon or 10% extra speed or 2 accellaration points or 20% reliability and you can change your choice after each hourly recalculation.
how much is added could vary per train.
That way you have some influence on creating the perfect train for the job. put a higher topspeed if you are doning a 5 track good.
add some accellaration if you are doing short haul or supply runs. or add an extra wagon if you are pushing levelup and better reliability might be the best pick for overnight hauling
choice you make for the extra slot applies to all trains of that type. so that is will make it more inviting to run several types of trains and setting them up differently. to do all needed tasks
There could also be some negative effect.
if you add 1 extra wagon then accelleration drops a few points
if you apply top speed or accelleration the reliability wil drop faster
if you apply reliability the topspeed drops a bit
those are the type of changes that are both realistic and easy to manage for most players.