Saturday I was trainwatching and shutterbugging at Myorenji Station on the Tokyu Toyoko Line in Yokohama (I wanted to see some of the run-through trains). The 5050 series are ubiquitous, but while they passed (or stopped with the 8 car units) I noticed most of the cars are equipped with ladders mounted on the sides (below the center doors), to allow passengers to easily get off in emergency situations. Perhaps there are other trains equipped in such a manner, but this is the first time I saw such a mounting rather obviously placed in the lower center of the car.