557

557 is a blue engine.

Photo
https://www.google.com/search?q=electric+engine&source=lnms&tbm=isch&sa=X&ei=WJ1lUpWbL_Si4AP8gYGABw&sqi=2&ved=0CAcQ_AUoAQ&biw=1024&bih=673#q=electric+train&tbm=isch&facrc=_&imgdii=_&imgrc=ErabQzcCUfTuAM%3A%3BKAZRLH67kEaW1M%3Bhttp%253A%252F%252Fassets.inhabitat.com%252Fwp-content%252Fblogs.dir%252F1%252Ffiles%252F2011%252F09%252Fre-620-electric-train2-537x337.jpg%3Bhttp%253A%252F%252Finhabitat.com%252Fworlds-strongest-electric-train-chugs-through-swiss-alps-with-over-10000-horsepower%252F%3B537%3B337