1) Autorenew for trains does not seem to work. It may be the same for other vehicles, but I've not noticed it yet. To reconstruct:
- Build a train
- Make sure autorenew is on, money is sufficient (or set to 0 in configuration), breakdowns are on and disable servicing is off. I toggled all to the correct states to make sure it was not a configuration glitch
- Sit back and wait 22 years for a train to get too old. It will visit depots to be fixed but not get renewed
2) "% load" and "full load" options break when moving from one rail-type to another. To reconstruct:
- Build a normal railway depot and train
- Give the train an order to full load at a station, this will work fine
- Convert the depot (with train inside) into monorail
- Delete the engine, replace with a monorail engine. This will keep the route
- Start the train off, you will find that "full load" is still set in the dialog but it doesn't full load at all, it just collects and leaves. Toggling "full load" on and off will fix it
3) Bridges aren't saved/loaded in the template patch
- Build a junction with bridges (or just a bridge, whatever)
- Select it all in template toolbar
- Save it
- Load it
- Paste it, bridges are missing
(I've reported this one on IRC)
Perhaps I'll find some more, but for now I can't be bothered to fix the routes of 55 trains to full load again

Thanks.