HO F7A / F7B Locomotive Set with DCC and Sound ATSF #257L #257A (ATHG19674)

HO Santa Fe F7A/F7B Locomotive Set with DCC & Sound (ATSF 257L / 257A) is a two‑unit pair that brings Santa Fe’s Phase I F7 diesels to HO‑scale layouts. This dual‑service set pairs an A‑unit configured for freight duty with a B‑unit capable of passenger service thanks to a steam generator, and both units feature water fills. Road‑number details mirror the Santa Fe roster, with 257L showing stainless‑steel grills and an inertial air filter representing a later version, while 257A completes the dual‑service pairing. Onboard DCC decoders with SoundTraxx Tsunami2 deliver authentic engine, horn and bell sounds that work in both DC and DCC, with two cube speakers delivering clear, balanced audio.

In addition to faithful appearance, the locomotives emphasize dependable performance and realism: a heavy die‑cast frame, LED lighting, see‑through cab windows and a full cab interior, plus etched metal details and body‑mounted McHenry scale‑knuckle couplers (Kadee compatible) for reliable operation. The set includes 21‑pin NM connectors for easy DCC wiring and Quick Plug compatibility for plug‑and‑play setup, and supports MU lashups with lead‑unit horn and lights. Minimum radius is 18 inches, with 22 inches or more recommended for smooth, trouble‑free operation on typical HO layouts.