Why 4-Motor Multiple-Unit Car Equipments?

The amount and quality of railroad suburban commuter service will probably increase, rather than decrease, in the future. On electrified roads, multiple-unit trains with all axles motored are coming into use. In contrast with conventional equipment, having about one-half the weight on drivers, these new trains have design and operating features which especially suit them to fill present needs and anticipate future requirements. These qualities are enumerated, and the resulting benefits discussed in their relation to both the passenger and the railroad.