Unfortunately this requires a session update. An update is being worked on, but meanwhile, the workaround is very easy.
Here is the post I did for one of the other sessions - just make sure you rename the loco correctly and everything should be fine.
While we investigate the cause for this to occur, the workaround is as follows:
1. Edit Session (instead of drive session)
2. Ctrl-F and fine "C&O Kanawha K-4 Steam Test 2"
3. Open the train tab and select Trains mode
4. Press G to get the consist and save it with a new name
5. Select the Delete tool, then delete the train
6. Select the Add tool and place the new consist
7. Click Cehicle mode then select the Properties tool
8. Click on the loco and edit the name to be "C&O Kanawha K-4 Steam Test 2"
9. Click Save and create a new session with a new name (e.g. add '1')
10. Click Quickdrive