Relying on terrorists to not attack the street car lines because some Arabs may be using them is mind-boggling idiocy. Anyone living in Israel knows that Arab terrorists have at times killed Arabs as well as Jews in their terror attacks. Arab terrorists have also pretended to be Jews in the past. The solution is to check everyone at every station, whether in a Jewish or Arab neighborhood. Something similar is used at all train stations - and again anyone in Israel knows that both Arabs and Jews use the trains.
Death toll in Baghdad attack on Shi'ite pilgrims rises to 19 (Reuters)
from the article: J'lem train company asks passengers: 'Do you mind traveling with Arabs?'