page_title: Slug (railroad)
section_title: Yard slugs
hierarchical_section_title: Slug (railroad) / Types / Yard slugs
caption_attribution_description: English: Diesel-electric locomotive serial 030 DA of SNCF. Français&#160;: Locomotive SNCF Diesel électrique Série 030 DA.
context_page_description: A railroad slug is an accessory to a diesel-electric locomotive. It has trucks with traction motors but, unlike a B unit, it cannot generate power on its own since it lacks a prime mover. Instead, the slug is connected to a powered locomotive, called the mother, which provides the needed electrical power to operate the traction motors, and the motor controls.
context_section_description: A yard slug is designed for switching, and therefore is built to increase visibility in low-speed operation. It has a low body and no cab, allowing the engineer or driver in the powered unit to see past it. Mother-slug sets are used in heavy switching, hump yard switching, and transfer runs between yards. Some are radio controlled without an engineer in the cab.
caption: SNCF Class 030 DA (then C 61000) and a TC 61100 slug for yard service.
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