HO RF-16 Sharknose Locomotive A SP 5551 Black Widow with Paragon4 (BLI7709)

HO RF-16 Sharknose Locomotive in Southern Pacific 5551 “Black Widow” livery with Paragon4 sound is an HO-scale A-unit that brings Baldwin’s Sharknose look and power to a model railroad layout.

Powered by Paragon4 Sound and Control System featuring Rolling Thunder, this model uses a dual‑mode decoder with Back EMF for smooth slow‑speed operation in both DC and DCC, and a precision drive designed for heavy towing and steady starts. The ABS body rides on a die‑cast chassis for strong tractive effort, while prototypically accurate paint, road numbers, and lighting enhance realism. It includes many separately applied details, authentic Baldwin Sharknose sounds, and MicroTrains‑compatible couplers, and runs on HO track codes 55, 70, and 80 with an 18‑inch minimum radius. These sharks are commonly offered in ABA configurations (powered A-unit with an unpowered B-unit), with additional powered A-units available for certain schemes.