When I take the bus in Jerusalem there are also Arabs on the bus, but so what..... The train is slightly different in that the driver doesn't see everyone getting on the train. You can't discount the risks but as 99% of the passengers are just folk what can you do?
We want Iran cooperation, not meddling, Gulf Arabs tell Kerry (Reuters)
from the article: J'lem train company asks passengers: 'Do you mind traveling with Arabs?'