Version of OpenTTD

1.9.1

Expected result

Train display (arrows).

Actual result

The train (arrow) is not displayed if newGRF is combined with another set of trains. In OpenTTD 1.8.0 this was not the problem, I could combine different train sets.

Steps to reproduce

I attach a file with newGRF PIPE and NUTS, but the problem is also when I combine PIPE with Iron Horse or Wired or Vacuum set or RIMS .... Any other set of trains will cause the train (arrow) of the NEWGRF PIPE set not to be displayed. This problem was not in OpenTTD 1.8.0

pipe-error.zip