Train line manager shows old train configuration images after train upgrade

Issue description

As shown in this image, Train Estimated Food time shows up in the Train lines manager as still having a configuration with two small locomotives and 4 small wagons, but when you click the train itself it shows its correct configuration (one large locomotive and two large wagons in this case).

Reproduction steps

1. Have a train in a line
2. Upgrade the train to a different configuration.
3. Observe that train configuration in train line manager does not update.

Game version and build number

v0.8.2a (b552)

Operating system

Windows

After reloading from a save, the train manager shows the correct train configuration, so it seem this is only an issue that last during a given session of play.